Question

if the simple interest on rupees 205 in 4 years is rupees 28.70 find the rate of interest percent per annum

Answer 1

Answer: is in the pic written by black pen

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Answer 2

Given: P$=205$rs., T$=4yrs.$, and $S.I.=28.70$rs.

We have to find the rate of interest percent per annum.

For this, we are using the formula of simple interest i.e;

$S.I.=\frac{P*R*T}{100}$

Therefore,

$=>S.I.=\frac{P*R*T}{100} \\\\=>28.70=\frac{205*4*R}{100} \\\\=>28.70*100=205*4*R\\=>2870=205*4*R\\\\=>\frac{2870}{205*4} =R\\\\=>R=3.5$

Hence, the rate of interest percent per annum is $3.5$%