High School Life Scenarios Allowance = $40 Taxes = 18% of GMI Gasoline = $3.05 per gallon Generally 15-19 miles per gallon (depending on car type, large cars get less) Cell Phone plans run $50 per month Bus Pass = $75 per month A college student typically attends 4.5 years of college College books usually cost about $500 per year A night out in high school typically costs between $15 -$50 Monthly clothing costs between $10 - $30 depending on your style Prom clothes/flowers for boy = $200 girls = $100