Question

a certain sum amount to rs 1331 in 1*1/2 years at 20% p. a. compound interest compounded half yearly determine the sum

Answer 1

133.1%=1331
100%=?
as 100% equal to principal=100*1331/133.1=1000rs

Answer 2

Answer:

Sum is  Rs 1000

Step-by-step explanation:

To calculate compound interest for half yearly,

the rate percent = 20 % it become half and time become double that is 1.5 to 3.

A = Rs  1331

A =  P ( 1 + r/100)^ t  

1331  = P * ( 1 + 1/10) ^3

1331 = P * ( 11/10)³

P = 1331 * 1000 / 1331

=  Rs 1000.

Hence the Sum is  Rs 1000.