JAMB Mathematics 2019 Paper

Concept:Profit percentage is calculated as $\frac{\text{profit}}{\text{cost price}} \times 100\%$.Explanation:Cost price: 200 mangoes at 4 for ₦2.50.Number of groups $= \frac{200}{4} = 50$.Total cost $= 50 \times 2.50 = 125.00$.So, cost price is ₦125.00.Spoilt mangoes $= 30$.Remaining mangoes $= 200 - 30 = 170$.Selling price: 170 mangoes at 2 for ₦2.40.Number of groups $= \frac{170}{2} = 85$.Total selling price $= 85 \times 2.40 = 204.00$.So, selling price is ₦204.00.Profit $= 204.00 - 125.00 = 79.00$.Percentage profit $= \frac{79.00}{125.00} \times 100\% = 63.2\%$.Answer:63.2% profit.Correct option: C.