Question

at what interest rate per annum will sum of rs 400 became rs 475 in three years​

Answer 1

Answer:

6.25%

Step-by-step explanation:

R=100 xl/pxn, R rate, Interest

P=principal, n=no. of yrs

R=100x75 / 400x3=25/4=6.25%

Answer 2

Principal = Rs.400, Amount = Rs.480

Simple Interest = Rs.(480−400)

=Rs.80

Time = 4 years

Rate in percentage =SI×100P×T

Rate in percentage =80×100400×4=80001600=5%

New rate of interest

=(5+2)=7%

Interest=400×7×4100=112

Hence amount=Rs.(400+112)

=Rs.512