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Simple Interest - General Aptitude

Q1:

A sum of money amounts to Rs. 9800 after 5 years and Rs. 12005 after 8 years at the same rate of simple interest. The rate of interest per annum is:

A 5%

B 8%

C 12%

D 15%

ANS:C - 12%

S.I. for 3 years = Rs. (12005 - 9800) = Rs. 2205.

S.I. for 5 years = Rs. 2205 x 5 = Rs. 3675
3
 Principal = Rs. (9800 - 3675) = Rs. 6125.
Hence, rate = 100 x 3675 % = 12%
6125 x 5