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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)