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

[EX Q]: Problem: the compound interest on $ 30,000 at 7 % p . a is $ . 4347 . find out the period ( in years ) ?
[EX A]: 2

[EX Q]: Problem: in a kilometer race , a beats b by 48 meters or 12 seconds . what time does a take to complete the race ?
[EX A]: 238 sec

[EX Q]: Problem: 252 ã · ? ã — 15 + 270 = 405
[EX A]:
28