WAEC Agriculture 2013 Paper

Concept:Percentage change measures the change in total quantity supplied when the price changes from $\mathrm{N}5{,}000.00$ to $\mathrm{N}3{,}000.00$ per kg.Explanation:From the table, find the total quantity supplied at the original price of $\mathrm{N}5{,}000.00$ per kg.Then find the total quantity supplied at the new lower price of $\mathrm{N}3{,}000.00$ per kg.Since price decreases, total quantity supplied also falls.Calculate the fall:Fall in quantity supplied $=$ Original total quantity $-$ New total quantity.Use the formula:Percentage change $= \frac{\text{Fall in total quantity supplied}}{\text{Original total quantity supplied}} \times 100\%$.Substituting the table values gives approximately $29\%$.Answer:D. $29\%$