Question

if the principal of Rs.1200 doubles in 6 years by simple interest, find the rate of interest.

Answer 1

rate of interest = 16.66%
Given,
t = 6 years
p = Rs.1200
A = p + i = Rs.2400
therefore, i = Rs.1200

W.K.T.
$i = \frac{ptr}{100}$
therefore,
$1200 = \frac{1200 \times 6 \times r}{100}$
on solving above u will get,
r = 16.66%