Question

a sum of money lent out at simple a amount to rupees 2200 in one year and 2800 in 4 years find the sum of money and rate of interest. and explain every formula

Answer 1

Let the Principal be P
So as per conditions after 4 years: P+(P*R*4/100)=2800 
As per 2nd condition P+(P*R*1/100)=2200
Subtract 2equation from 1
3P*R/100=600
P*R=20000
Put the value of P*R in equation 1
P+(20000*4/100)=2800 =>P=2000
R=10%