Question

sara deposited rs 1435 for 3 yrs and 9 months at the rate of 5 p.a . find the amount at maturity

Answer 1

Solution :-

P = Rs. 1435

R = 5 %

T = 3 years and 9 months

First the compound interest for 3 years will be calculated and then the amount after 3 years will be considered as principal and on this principal the simple interest for 9 months will be calculated.

Compound interest for 3 years -

A = P (1 + R/100)ⁿ

⇒ 1435 (1 + 5/100)³

⇒ 1435*21/20*21/20*21/20

⇒ 13289535/8000

= Rs. 1661.19

Now for the next 9 months the principal will be Rs. 1661.19

Simple Interest = (P*R*T)/100

⇒ (1661.19*5*9)/(12*100)

⇒ 74753.55/1200

S.I. = Rs. 62.29

Amount = P + I

A = 1661.19 + 62.29

= Rs. 1723.48

So, amount at maturity will be Rs. 1723.48

Answer.

Answer 2

simple interest = PNR/100

=1435*3 9/12*5/100

=1435*3.75*5/100

=269.06.....rs

so add principle and interest.....

=1435+269.06

=1704.06rs is the amount