Melissa and joey enjoyed dinner at a restaurant. they paid the waiter $100.50 plus a 20% tip. how much did each person pay if they split the total bill in half?

In the question it is already given that Melissa and Joey would have to share the total bill along with the tips at the resturant during their dinner. The paid the water an amount of $100.50 and additional 20% tip.Firstly we have to find the amount of the tip and then add with the total amount to calculate the total amount paid by both of them.
Amount of tips paid to the waiter = (20/100) * 100.50 dollars
                                                     = 2010/100 dollars
                                                     = 20.10 dollars
So Melissa and Joey paid $20.10 as tips to the waiter.
Then the total amount paid  by both of them = (100.50 + 20.10) dollars
                                                                       = 120.60 dollars
Then the amount paid by Melissa and Joey = 120.60/2 dollars
                                                                     = 60.3 dollars.
So Melissa and Joey will individually pay $60.3 each.