If the compound interest on a certain sum of money for 3 years at 10% per annum be Rs. 993, what would be the simple interest? Pick one
A) rs . 880	B) rs . 890	C) rs . 895	D) rs . 900	E) none

Rationale: let p = principal a - amount we have a = p ( 1 + r / 100 ) 3 and ci = a - p atq 993 = p ( 1 + r / 100 ) 3 - p ? p = 3000 / - now si @ 10 % on 3000 / - for 3 yrs = ( 3000 x 10 x 3 ) / 100 = 900 / - answer : d .
Answer: D