Question

At what rate per cent of simple interest on rupees 3750 be one fifth of itself in 4 years? To what will it amount in 15 years?

Answer 1

P = 3750

T = 4 years

Given,

I = 1/5 x 3750 = 750

I = (P x R x T)/100

750 = (3750 x R x 4)/100

3750 x R x 4 = 750 x 100

R = (750 x 100)/(3750 x 4)

R = 5%

For 15 years,

I = (3750 x 5 x 15)/100

I = 28125/10 = ₹2812.50

Amount = P + I

Amount = 3750 + 2812.50 = 6562.50

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Answer 2

Answer:

R= 5%

A = 6562.50₹ After 15 years.

Step-by-step explanation:

Given Data

• Principal = 3750₹

• S.I = 3750/5= 750₹

• R= ?

• Time = 4 year

So,

S.I = (P×R×T)/100

750=(3750×4×R)/ 100

R = (750 ×100)/ 3750 × 4

R= 5% Ans... (1)

So,

S.I of 4 yr = 750₹

1 yr = 187.5

15yr S.I = 187.5 × 15 = 2812.5 ₹

Amount = S.I + Principal

A= 2812.5 + 3750

A = 6562.50₹ After 15 years. .... Ans