instruction:
The task is to generate the correct answer for a given math problem.
question:
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 ?
answer:
7 %


question:
Problem: a dishonest dealer professes to sell goods at the cost price but uses a weight of 800 grams per kg , what is his percent ?
answer:
25 %


question:
Problem: a train 175 m long , running with a speed of 63 km / hr will pass a tree in ?
answer:

10 se