Jackie's net income for the day is the amount earned less expenses:
... $12.50 -1.90 -4.65 = $5.95
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<em>Comment on the problem</em>
For tax purposes, very likely Jackie could not consider the price of lunch to be a business expense. Thus, her business income is $12.50 -1.90 = $10.60. The cost of lunch is possibly an expense Jackie would incur whether she mowed a lawn or not.
