Question

find the rate of interest if the interest on 1800 for 4 years is 432

Answer 1

Given interest = Rs 432, Time = 4 years, sum = Rs 1800
Interset = sum*time*rate of interest/100
432 = 1800*4*rate of interest /100
rate of interest = 432*100/7200 = 6%
The rate of interest is 6%   

Answer 2

p is 1800 ,t is 4, r is 432. si = p×r×t.