Question 13375: i dont get this problem. instructions: set up an equation and solve. 1. sara went to lunch with her friends. the sandwich she bought cost $4.95. if the tax rate was 7.5%, what was the total cost of the sandwich? [i asked my teacher but it still didn't make any sense to me]
Answer by akmb1215(68)   (Show Source):
You can put this solution on YOUR website! In order to work problems with percents, you need to change the percent to a decimal (in this case, 7.5% = .075). When you figure tax, you multiply whatever you are buying by the tax rate. Then, you have to add whatever you buy back to it in order to get the total price. Your equation, therefore, will be  . In that equation, I added the cost of the sandwhich to the tax on the sandwhich to get C, the total cost. To solve the equation, first multiply to make the equation  ; then add to get  . Since money is rounded to the nearest hundredth, you need to round this answer to the nearest hundredth, which gives you a total cost of $5.32.
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