Question

. The difference between compound interest and simple interest for 3 years at the rate of 20% p.a is 512. What is the principal?​

Answer 1

Answer:

We have,

Difference between C.I and S.I for 3 years =152

R=20%

P=?

We know that the difference between C.I and S.I for 3 years

=P(100R)2(100R+3)

Therefore,

P(10020)2(10020+3)=152

P(51)2(51+3)=152

P(51)2(516)=152

P(12516)=152

P=Rs. 1187.50

Hence, this is the answer.

Answer 2

Answer:

We have,

Difference between C.I and S.I for 3 years =152

R=20%

P=?

We know that the difference between C.I and S.I for 3 years

=P(

100

R

)

2

(

100

R

+3)

Therefore,

P(

100

20

)

2

(

100

20

+3)=152

P(

5

1

)

2

(

5

1

+3)=152

P(

5

1

)

2

(

5

16

)=152

P(

125

16

)=152

P=Rs. 1187.50

Hence, this is the answer.