If the compound interest on a certain sum of money for 6 years at 10% per annum be Rs. 993, what would be the simple interest?
Select the correct option
A) rs . 880 B) rs . 890 C) rs . 1800 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 6 yrs = ( 3000 x 10 x 6 ) / 100 = 1800 / - answer : c ."
Answer: C