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Compound Interest - General Aptitude

Q1:

Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is:

A Rs. 1550

B Rs. 1650

C Rs. 1750

D Rs. 2000

ANS:C - Rs. 1750

C.I.
= Rs. 4000 x 1 + 10 2 - 4000
100
 
= Rs. 4000 x 11 x 11 - 4000
10 10
  = Rs. 840.
 Sum = Rs. 420 x 100 = Rs. 1750.
3 x 8