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

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 %
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Q: Problem: find the greatest number that will divide 205 , 626 and 588 leaving 5 , 6 and 8 as remainders respectively

A: 2
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Q: Problem: the sum of first 45 natural numbers is ?

A:
1035
****