Question

A certain sum amounts to 2200 in 2 years to 2800 in 4 years at simple interest. Find the sum and rate percent per annum?

Answer 1

Given:

In 2 years Amount= 2200.........................(1)

In 4 years Amount =2800.........................(2)

To find:

Sum and rate percent

Let the sum =P

Rate percent = R%

from equation 1 and 2 we can say that simple interest in 2 years= 600

hence P+600=2200

∴ P=1600

we know that SI=P*R*T/100

600=1600*R*2/100

R=18.75%

Answer 2

Answer:

18¾%

Step-by-step explanation:

2 years amount = Rs 2200

4 years amount = Rs 2800

Sum = P (principal)

R = R% (rate)

hence, si (simple interest) in 2 years is Rs 600

P+600 = Rs 2200

P = 2200 - 600

= Rs 1600

SI = P×R×T/100

= 1600 × R × 2/100

= 18¾%

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