Consider a lady took a loan from a bank at the rate of 12% p.a. simple interest. After 3 years she had to pay Rs. 7200 interest only for the period. The principal amount borrowed by her was  Select the correct option:
A) rs . 2000
B) rs . 10000
C) rs . 15000
D) rs . 20000
E) none of these

Rationale: explanation : principal = rs . ( 100 × 7200 / 12 × 3 ) = > rs . 20,000 . answer : d
Answer: D