<PRE><B>Question 935454</B>
old rate:
3 kids for 3 hours:
3 * 3 * 4.00 = 36
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new rate:
4 kids for 3 hours:
4 * 3 * 4.75 = 57
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difference:
57 - 36 = 21
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answer:
she&#39;ll earn $21 more
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