In a particular year, Nigeria's total agricultural output was valued at ₦480 billion, of which food crops accounted for 60% and cash crops accounted for the rest. If the value of cash crop output increased by 25% in the following year while food crop output remained unchanged, what was the total value of agricultural output in the following year?

Food crops = 60% of ₦480bn = ₦288bn; Cash crops = 40% of ₦480bn = ₦192bn. A 25% increase in cash crops gives ₦192bn × 1.25 = ₦240bn. Total output in the following year = ₦288bn + ₦240bn = ₦528bn. Option B (₦576bn) results from applying 25% to the total output, Option C (₦552bn) from applying 25% to food crops instead, and Option D (₦600bn) from applying 25% to both components — all common arithmetic errors.