SSC CGL 26 Oct 2014 Shift 1 Paper

Question : 122 of 200

Marks: +1, -0

The compound interest on 1,800 at 10% per annum for a certain period of time is 378. Find the time in years.

Solution:

Amount = Principal + C.I.
= Rs. (1800 + 378) = Rs. 2178
A = P

(1+R/{100})^T

⇒ 2178 = 180

(1+1/{100})^T

⇒

{2178}/{1800}

({11}/{10})^3

({11}/{10})^T

⇒

{121}/{100}

({11}/{10})^2

({11}/{1})^T

∴ Time = 2 years

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