SSC CGL Tier II 21 Sep 2014 Paper

Question : 1 of 100

Marks: +1, -0

PAPER-I : QUANTITATIVE ABILITIES

The compound interest on a certain sum of money for 2 years at 5% is ₹ 328, then the sum is

Solution:

(3) Let the principal be Rs. P

∴{C.I.}= {P} [ (1+ { {R}}/{100} )^{2}-1 ]

⇒ 328= {P} [ (1+ {5}/{100} )^{2}-1 ]

⇒ 328= {P} [ ( {21}/{20} )^{2}-1 ]

⇒ 328= {P} ( {441}/{400}-1 )

⇒ 328= {P} ( {441-400}/{400} )

⇒328= {41 {P}}/{400}

⇒{P}= {328 × 400}/{41}= {Rs} .3200

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