Nawaz Sahrif spends 10% of his income in house rent, 20% of the rest on his children's education, 25% of the rest miscellaneous causes. If he now posses Rs. 1944 then his income is_______?
Correct answer: A. Rs.3600
- A. Rs.3600
- B. Rs.4000
- C. Rs.4500
- D. Rs.3000
Explanation
After paying 10% rent, 90% of the income remains. After spending 20% of that on education, 80% remains, and after spending 25% of that on miscellaneous causes, 75% remains; therefore, the amount left is 0.90 x 0.80 x 0.75 = 0.54 of income. Thus, 0.54x = Rs.1,944, giving x = Rs.1,944/0.54 = Rs.3,600. The likely trap is Rs.4,000, which applies all percentages directly to the original income instead of successively to the remainder.
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