or
or
In 5 years, capital will be 200 tk
so, the interest = (200 - 100) = 100tk
we know, i = pnr
or, r = i/pn
or, r = 100/(100*5)
∴r = 1/5
the rae of simple interest = 1/5 * 100% = 20%
ans: 20%
