Question

The simple interest on a certain sum of money is rs.84 in 2 years at 5% per annum.
What interest will the same sum yield in 3 years at 8% p.a.?
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Answer 1

Step-by-step explanation:

$si = \frac{prt}{100} \\ \: \: \: \: \: = \frac{84 \times 2 \times 5}{100}$

$= \frac{84 \times( 2 + 3)\times (5 + 8)}{100}$

$= \frac{84 \times 5\times 13}{100}$

$= \frac{21 \times 13}{5}$

$= \frac{321}{5}$

$= 64.2$

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