If the radius of a circle is decreased by 11% then the total decrease in the area of the circle is given as:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 20.79%
We need to find the combined decrease which is similar to the discount on some items.
⇒ (-a) + (-b) + (-a)(-b)/100
⇒ -a - b + ab/100
⇒ -11 - 11 + 1.21
⇒ -22 + 1.21
⇒ 20.79%