Population of a village is three lakh out which 40% were male and the rest were females. The male population earned a profit of 6% and the female population earned 8% on an investment of Rs.1200 each. Find the change in percentage profit of the village if the ratio of male to female gets reversed the next year, population remaining the same?
Let the population of the village be 100. Initially, ∴Number of males = 40 and Number of females = 60 ∴Total profit earned by males and females = 40 × 0.06 + 60 × 0.08 = 2.4 + 4.8 = 7.2 Next year, Number of males = 60 and Number of females = 40 ∴ Total profit earned by males and females = 60 × 0.06 + 40 × 0.08 = 3.6 + 3.2 = 6.8 ∴ Percentage change = 7.2 - 6.8 = 0.4 (decrease)
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