For this chain-of-thought reasoning and answer, what was the question?
Total expenditure = 40 + 25 + 15 + 10 = 90%
Saving = (100 - 90) = 10%
10/100 × Salary = 1200, Salary = 12000 Rs.
 A: (A)

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: A person spends 40% of his salary on food, 25% on house rent, 15% on entertainment and 10% on conveyance. If his savings at the end of the month is Rs. 1200, then his salary per month in rupees is:
Options:
(A) 12000
(B) 6000
(C) 8000
(D) 10000
(E) None of these