A man took loan from a bank at the rate of 12% p.a. S.I. After 20 years he had to pay Rs. 2100 interest only for the period. The principal amount borrowed by him was?
Select
A) 600 B) 715 C) 600 D) 875 E) 900

Rationale: "principal = ( 100 * 2100 ) / ( 12 * 20 ) = rs . 875 answer : d"
Answer: D