Question

What is the rate percent when the simple interest on Rs. 800 amount to Rs. 160 in 4 years?

Answer 1

800*4*r/100=160=>3200*r=16000=>r=16000/3200=>r=5%per annum

Answer 2

Answer:  The required rate percent is 5%.

Step-by-step explanation:  We are given to find the rate percent when the simple interest on Rs. 800 amount to Rs. 160 in 4 years.

Here, we have

Principal, P = Rs. 800, Simple interest, S.I. = Rs. 160 and time, n = 4 years.

Let r% be the required rate of simple interest.

Then, according to the formula of simple interest, we have

$S.I.=\dfrac{Prn}{100}\\\\\\\Rightarrow 160=\dfrac{800\times r\times4}{100}\\\\\\\Rightarrow 32r=160\\\\\Rightarrow r=\dfrac{160}{32}\\\\\Rightarrow r=5.$

Thus, the required rate percent is 5%.