<human>:  Grover bought 3 boxes of face masks. He plans to sell them for $0.50 each. If each box has 20 face masks, and he bought the 3 boxes for $15, how much will be his total profit?
<bot>: How much will he earn from each box? ** Grover will earn $0.50 x 20 = $<<0.50*20=10>>10 for each box.
How much will he earn after selling all the face masks? ** So, he will earn $10 x 3 = $<<10*3=30>>30 after selling all the face masks.
How much will be his total profit? ** Therefore, his total profit will be $30 - $15 = $<<30-15=15>>15.
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