The cost for the meal was:
$32.38
Since they gave a tip of 20%, we need to calculate how much is 20% of $32.38 and then add that to the cost of the dinner.
Calculating 20%.
We multiply the amount $32.38 by 20%:
[tex]20percent=\frac{20}{100}[/tex][tex]$32.38$\times\frac{20}{100}=\frac{32.38\times20}{100}=6.476[/tex]The tip of 20% was $6.476
Thus, the total cost of their bill will be:
[tex]32.38+6.475=38.856[/tex]Answer: $38.856