A birthday celebration meal is $42.60 including tax, but not the tip. Find the total cost if a 10% tip is added to the cost of the meal.
Tip = 10% = 1/10=0.1
Total cost= 42.60 + 42.60*0.1
Total cost= 42.60 + 4.26
Total cost= 46.86
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The cost of the meal is $46.86.