To find out how much money William made this year, we first need to calculate how much 340% more than last year's earnings of $620 is.
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Calculate 340% of last year's earnings: \[ \text{340% of } 620 = \frac{340}{100} \times 620 = 3.4 \times 620 = 2108 \]
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Add this amount to last year's earnings: \[ \text{Total earnings this year} = 620 + 2108 = 2728 \]
Therefore, William made $2728 this year.