1250 / 100 = $12.50 each
30 * 10 = 300
70 * 15 = 1,050
300 + 1,050 = $1,350
1,350 - 1,250 = $_________
A book dealer bought 100 books for $1250. If she sold 30% of these at $10 each and the rest at $15 each, what was her total profit?
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