Question

BillieÍs monthly cell phone bill includes the cost of cell phone service, 15% tax on the cost of the cell phone service, and a $9.25 data fee. BillieÍs monthly cell phone bill totals $61.

What is the cost of the cell phone service before tax is added?

Answer 1

x - the cost of cell phone service before tax is added


`x+15\%x+9.25=61 \\x+ 0.15x=61-9.25 \\1.15x=51.75 \\x= (51.75)/(1.15) \\x= 45`