Answer:
$69.60
Explanation:
The desired amount (total cost) is equivalent to the sum of the bill and 20% of the bill, or, equivalently, 120% of the bill.
1.20($58) = $69.60
The total cost is $69.60, including a 20% tip.
20% of $58 is $11.60. So you add $11.60 + 58 which equals $69.60, so that is the total cost.
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