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Answer :

the amount he would make if he broke none:
576 x 0.05 = 28.80

subtract what he made from this:
28.80 - 22.71 = 6.09

divide 6.09 by 1.98 to see how many glasses he broke:
6.09 / 1.98 = 3.0757

he broke 3 to 4 glasses.

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