Answer:
$27.816
Explanation:
First we have to find out what 20% of 23.18 is. Let x represent the amount of the tip.
(cross multiply)
20 = x
100 23.18
20 x 23.18 = 463.6
463.6 ÷ 100 = 4.636
x = $4.636
Now we add the amount of the tip to the original price of the dinner.
23.18 + 4.636 = 27.816
Therefore the total cost of the dinner including the tip is $27.816