Question

the bill in a restaurant totaled $4.50 we wanted to give a tip of 20% how much money did we tip the waiter

Answer 1

20% of 4.50 would be 0.90, therefore $0.90 would be the tip.

Answer 2

You tipped the waiter $0.90.
Your total after the tip is going to be $5.40
 4.50 x 0.2= 0.9
4.5+(4.5 x 0.9)= 5.40
Hope this helped!