The task is to generate the correct answer for a given math problem.

[Q]: Problem: by investing in 1623 % stock at 64 , one earns rs . 1500 . the investment made is
[A]: rs . 5760


[Q]: Problem: a lent rs . 5000 to b for 2 years and rs . 3000 to c for 4 years on simple interest at the same rate of interest and received rs . 1540 in all from both of them as interest . the rate of interest per annum is ?
[A]: 7 %


[Q]: Problem: 11 is subtracted from 40 % of a number and results is 23 . what is the number ?
[A]:
85