1 answer
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To find out how much Ted earned after his donation, we need to subtract the amount he donated from his salary.
Ted donated 1/25 of his salary, which is equal to (1/25)*$42,000 = $1,680.
Thus, Ted earned $42,000 - $1,680 = $40,320 last year after his donation.
Therefore, the correct answer is $40,320.