Question

a certain sum of money becomes 16400 in 7 years the simple interest at 15%. calculate the sum​

Answer 1

Let the sum be 100

Interest=sum×time×rate/100

=100×7×15/100

=105

amount =100+105

=205

If amount =205 then principle=100

If amount =1 then principle=100/205

If amount =16400 then principle =100×16400/205

=8000Ans

Step-by-step explanation:

1 First we will take sum as 100.

2 Then we will take out the interest with same sum.

3 Then will take out the amount by adding the interest with principle.

4 Then we will use the unitary method.