The compound interest on a certain sum of money for 2 years at 10 % per annum is Rs.420. The simple interest on the same sum at the same rate and for the same time will be?
Options:
A .  Rs.350
B .  Rs.375
C .  Rs. 380
D .  Rs. 400
Answer: Option D
The principle is P. P(1 +10/100) 2 “ P = 420 => P = Rs.2000 S.I = Rs.(4000/100) = Rs.400
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