Answer: The total cost of the meal would be $77.88
Start with the original cost of the meal: $66.70.
Calculate the tip amount by multiplying the original cost by the tip percentage: $66.70 x 0.18 = $11.88.
Add the tip amount to the original cost of the meal: $66.70 + $11.88 = $77.58.
Round up to two decimal places: $77.88.
Therefore, if you spent $66.70 and want to tip the waiter 18%, the total cost of the meal would be $77.88.
I hope this helps!