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Billie’s 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. Billie’s monthly cell phone bill totals $61.
What is the cost of the cell phone service before tax is added?
bill=cost of service+ (15% of cost of service)+data fee bill=61 data fee=9.25 percent means parts out of 100 so 15%=15/100=0.15 'of' means multiply c=cost tax=0.15 times c or 0.15c
61=1c+0.15c+9.25 add like terms 61=1.15c+9.25 subtract 9.25 from both sides 51.75=1.15c divide both sides by 1.15 45=c
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