A farmer has 20 laying hens. In one week, the hens laid a total of 98 eggs. What is the hen-day production percentage for that week?

Hen-day production (%) = (Total eggs laid ÷ (Number of hens × Number of days)) × 100. Total possible eggs = 20 × 7 = 140. Percentage = (98 ÷ 140) × 100 = 70.0%. Option A results from dividing 98 by 20 × 10, and option D from a decimal error.