Question

At what rate of interest will a sum increase by 40
% in 2 years under SI?
Select one:
O a. 20%
O b. 15.0%
O c. 7.5%
O d. 22.5%​

Answer 1

Answer:

7.5%

I think so this is the answer hope it helps

Answer 2

The rate of interest at which the sum increase is 20%

Given:

Time = 2 years

Percentage increase = 40%

To find:

At what rate of interest will a sum increase by 40%

Solution:

Let the initial amount be = Rs.100

Thus, since the percentage increase is 40%, therefore -

After two years sum will be = 140

SI = 40

Calculating the rate, by using the formula of SI -

SI = PRT/100

Now,

R = SI × 100 / ( P × T)

R = 40 × 100 / 100 × 2

R = 4000/200

R = 20

Answer: The rate of interest at which the sum increase is 20%

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