Subject: mathqa
Question: a sum of rs . 100 is lent at simple interest of 3 % p . a . for the first month , 9 % p . a . for the second month , 27 % p . a . for the third month and so on . what is the total amount of interest earned at the end of the year approximately
Option: 
A: rs . 66430
B: rs . 65930
C: rs . 67430
D: rs . 791160
Answer: A