In a recent flu epidemic, the number of flu cases increased by 40% each week. There were 3,000 flu cases during the first week of January. How many more people were affected by the flu during the third week of January than during the first week?

Each week, the number of cases is multiplied by 1.40. By the third week, there are 3,000 × 1.40 × 1.40 = 5,880 cases. The increase from the first week is 5,880 − 3,000 = 2,880, so the answer is 2,880.

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