Dinner cost = $80
tax = %8
tip = %20 before tax
Multiply the dinner cost buy the tax percentage in decimal form ( divided by 100)
Tax amount =80 x (8 /100 ) = 80 x (0.08 ) = $6.4
Same process for the tip amount:
Tip amount = 80 x (20/100) = 80 x 0.2 = $16
Add both amounts to the dinner cost
Total bill = 80 + 6.4 + 16 = $102.4
