**At what rate percent of simple interest will the interest on Rs.3750 be one-fifth of itself in 4 years ? To what will it amount in 15…**

###### Answers:

P = Rs. 3750

I = Rs. 3750 × (1/5)

= Rs. 750

T = 4 years

R = (100 × I)/ (P × T)

= (100 × 750)/ (3750 × 4)

= 5%

Again, P = Rs. 3750

Interest of 4 years = Rs. 750

Interest of 1 years = Rs. (750/4)

Interest of 15 Years = Rs. (750/4) × 15

= Rs. (750 × 15)/4

= Rs. (5625/2)

= Rs. 2812.50

Amount in 15 years will be

= Rs. 3750 + Rs. 2812.50

= Rs. 6562.50

∴ Rate = 5%

Amount in 15 years will be

= Rs. 6562.50