Question

We have two numbers „a‟ and „b‟. „a‟ is equal to the square of „b‟. If „b‟ is increased by

10%,

by what percent does „a‟ increase?

A. 10%

B. 20%

C. 100%

D. 21%​

Answer 1

Answer:

D. 21%

Step-by-step explanation:

a and b are 2 numbers such that

a= b^2

if b is increased by 10% then a is

a1= (b+b×0.1)^2

a1= (1.1b)^2

a1= 1.21 × b^2 = 1.21× a = 121/100 ×a= 121% a

so a is increased by 21%