Martin finds a shirrt on sale for 10% off at a department store. the original price was $20. martin must also pay 8.5% sales tax. how much is the shirt after taxes are applied?

10% off
original price=20
tax=8.5%

percent means parts out of 100
10%=10/100=0.10
10% of 20 then tax so
'of' in math means multiply
0.1 times 20=2
10% off
20-2=18

then tax is added
8.5%=0.085
8.5% of 18=0.085 times 18=1.53
that's tax to it's added on the 18
18+1.53=19.53
the shirt costs $19.53

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

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