You want to buy a cd that cost $18.50. the sales-tax rate in your states is 4.5 percent. how much sales tax will you pay for this cd?

4.5% = 0.045

 multiply 18.50 by 0.045 foe the amount of sales tax

18.50 * 0.045 = 0.83

 they pay 0.83, which is 83 cents in sales tax

no this is a nonlinear negative