Question

In what time will Rs 1860 amount to Rs
2278.50, if simple interest is calculated at 9% per annum .

Answer 1

Here is your answer.

SI = Amount-Principle
So, SI= Rs 418.5

As we know,
$t = \frac{100 \times si}{p \times r} \\ t = \frac{100 \times 4185}{1860 \times 9 \times 10} \\ t = 2.5 \: years$
Hope it helps you.

Answer 2

Given :

Principal = Rs.1860

Amount = Rs.2278.50

Rate of interest = 9%

To find :

Time

Solution:

Principal = Rs.1860

Amount = Rs.2278.50

Rate of interest = 9%

Simple interest = Amount - Principal

Simple interest = 2278.50-1860

Simple interest =418.5

Formula :

$SI = \frac{P \times T \times R}{100}$

So, $418.5=\frac{1860 \times T \times 9}{100}\\\frac{418.5 \times 100}{1860 \times 9}=T\\2.5 = T$

Hence Rs 1860 amount to Rs .2278.50 in 2.5 years