Question

if 3750 amount to 4,620 in 3 years at
simple interest. Find :
() the rate of interest.
(ii) the amount of 7,500 in 5 years at the
same rate of interest​

Answer 1

Answer:

(i) In first case :

A = Rs. 4620

P = Rs. 3750

I = A – P = Rs. 4620 – Rs. 3750 = Rs. 870

T = 3 years

R = (100 × I)/(P × T) = (100 × 870)/3750 = (4 × 29)/15

= 116/15 = 7. 11/15%

In Second Case :

P = Rs. 7500

R = 116/15%

T = 5. ½ years = 11/2 years

Interest = (P × T × R)/100

= Rs. (7500 × 11 × 116)/(2 × 15 × 100) = (250 × 116 × 11)/100

= 10 × 29 × 11 = 290 × 11 = Rs. 3190

Amount = Rs. 7500 + 3190 = Rs. 10,690