Question

for a sum of ₹ 1800 the interest became ₹675 after some years the rate of interest was 15% per annum find the time period

Answer 1

Principle = ₹1800
Simple Interest=₹675
Rate=15%
Then,
Time = S.I multiply 100 divided by principle multiply Rate
then the answer is = 2.5 or 2 years 5 months

Answer 2

$1800 \div 100 \times x = 675$
x is the rate of interest