Question

| If the interest on Rs. 800 in 2 years be more than the interest on Rs. 400 by Rs. 40 in 2 years, find the rate of simple interest.??????

A. 6%

B. 7.5%

C. 5%

D. 10%​

Answer 1

Answer:

Principal = Rs 2000

Time = 4 years

Interest = Rs 400

Let Rate of Interest= R

Now, Interest=

100

Principal×Rate×Time

400=

100

2000×R×4

R=

2000×4

400×100

Answer 2

Answer:

c.5%

Step-by-step explanation:

Given:

P1 = Rs.800

P2 = Rs.400

Time = 2 years

Difference in S.I. = Rs.40

Formula used:

S.I. = (PRT)/100

Calculation:

(P1RT)/100 - (P2RT)/100 = 40

⇒ RT(800 - 400) = 4000

⇒ R = 4000/800

⇒ R = 5%

∴ The rate of simple interest is 5%