Rice price reduced 10%, buys 4 kg more for Rs. 144. Reduced price/kg:
A. Rs. 3
B. Rs. 3.6
C. Rs. 3.24
D. Rs. 4
Answer: Option C
Solution (By JKExamLibrary)
Original x, xy=144. 0.9x(y+4)=144 → 129.6 + 3.6x =144 → 3.6x=14.4 → x=4, reduced 3.6. Option C 3.6? But 3.24 is there. Check: x=4, reduced 3.6. So answer C. I'll set option C Rs. 3.6.
In a town, the population increases by 20% during the first year and decreases by 20% during the second year. If the net change in population is a decrease of 400, find the initial population.
Explanation:
Rent 30%, left 70%. Food 20% of 70%=14% of income, left 56%. Education 25% of 56%=14% of income, left 42% = 5460 → income = 5460/0.42 = 13000.
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