A certain sum is invested for certain time It amounts to Rs 600 at 10 per annum But when invested at...........

Quantitative Aptitude ( CCS) Simple Interest

A certain sum is invested for certain time. It amounts to Rs. 600 at 10% per annum. But when invested at 5% per annum, it amounts to Rs. 400. Find the time.

40 years

75 years

50 years

60 years

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Explanation:

Solution:
600-P=P*10*t/100 —>1===>6000-10P=Pt
400-P=P*5*t/100—->2===>8000-20P=Pt
Equate 1 and 2 6000-10P=8000-20P==>P=200
Substitute P in 1 then 400=200*5*t/100==>40yrs.