The bil with the 8% tax:
$25.30 + $25.30*8/100
$25.30 + $2.024 (Multiplying)
$27.324 (Adding)
The first answer is: $27.324
Total cost of the lunch:
$27.324 + $27.324*18/100
$27.324 + $4.918 (Multiplying)
$32.242 (Adding)
The second answer is : $32.242