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Let's do this question and be are to Spears surface area of BP's 800 percent higher than a volume of

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is lower than the volume of B by exposing findings was the video.

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Give it a try and then let's do it together.

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All right.

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We are back.

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Let's do it together.

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So over here we have two spears, E and B and let the radius of speare A, B, R, E, and let the release

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of Speare B are B in that case, the surface area of is four by our square and the surface area of Sparboe

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is four by R B Square.

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Now it's given that this over here is equal to nine times or Pyi or Square.

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Right.

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Why is that so.

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Because it's mentioned that the surface area of Sparboe is eight hundred percent higher than it.

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Right.

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What does that mean?

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Let's take an example.

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Say X is equal to Hundert and it's given that Y is 200 percent greater than X, then what is the value

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of white?

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The value of white in this case will be under, which is X plus two hundred percentage of hundred.

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Right.

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That's hundred plus two hundred by a hundred in two hundred.

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And that is equal to three in 200 or 300.

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Similarly over here it's eight hundred percent higher.

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So it's four by our square.

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Plus eight times or by are is square, and that is equal to nine times for by R-squared.

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All right, let's proceed.

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Therefore, we get that R B squared right over here.

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I can cut out for paying for pie.

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So R B square is equal to nine times or a square.

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All right.

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Now, this means that R B is equal to three times are now over here.

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The volume is will be four by three by are a cube.

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Right.

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That's the volume of a spear.

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And over here the volume will be four by three by RB Q.

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Right now, over here, instead of Arby, let's substitute three, but this becomes or by three by industry

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are the whole cube, right.

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That's equal to twenty seven in two or by three by ah.

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A cube.

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Right.

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Now, over here, if this is equal to white, this would be 27 in white, right?

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This is taken as white.

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This is 27 into white.

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Now we need to find the percentage decrease from 27 white to white.

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That's what is our strength.

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The volume of it is X percent is lower than the volume of meat.

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So you're starting with the volume of B, right?

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Because the question is volume of A is lower than the volume of B by person.

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So you need to go from twenty seven white to white.

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Right.

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So the percentage change is change divided by the initial value.

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Always remember that if any of you want to find the percentage change, it's change by the initial value

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in two hundred.

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So over here the change is twenty seven Y minus Y which is twenty six.

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But the important thing is you need to take the correct initial value.

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Right.

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Or here you start with twenty seven y.

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Right.

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Because you are going down from volume of B, therefore the denominator over here is twenty seven and

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the correct answer is twenty six by twenty seven in two hundred.

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That's equal to ninety six percentage which is option Deora here.