Question

Roscoe's family has a dinner at a restaurant. The total cost is $103.80. This includes 5% tax and 15% tip on the pre-tax amount. How much was the bill before tax and tip?

Answer 1

so if the pretax and tip cost is 100%

then the bill is 120%...

so 120% = 103.80

I'd divide the bill by 12 and then multiply by 10 to get the pre-tax bill