The total amount they paid for dinner that night = $22.2
Explanation:Dinner bill = $18.50
They paid 5% food tax
Food tax = (5/100) x 18.50
Food tax = $0.925
They left a 15% tip for the waiter
Tip = (15/100) x 18.50
Tip = $2.775
Total amount paid = Dinner bill + Food tax + Tip
Total amount paid = $18.50 + $0.925 + $2.775
Total amount paid = $22.2
The total amount they paid for dinner that night = $22.2
