aptitude

Question

a principal become rupee 900 after 3 years and 1200 after 6 years on simple intrest then find the principal and rate of intrest?

Answer 1

This is simple interest that means every year increment in amount is same

 900 after 3 years

1200 after  6 years

amount increases 300 in 3 years that means every year amount increases by 100

so original amount is 900-3*100=600

Principal amount=600

rate of growth=100/600= 16.67%

Answer 2

principle amount= 600

rate of interest= 16.667 % per year..

Comments

show the calculation

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P+3*P*R=900

P+6*P*R=1200..

solving above two we get R=1/6=16.667%  P=600