Robert bought a used automobile for $1,500.00. If the sales tax is 5%, what will be the total that Robert had to pay for the automobile? 2. ## Sales Tax First, 5% sales tax is 5/100 or 0.05. So you say 5% of$1500.00. "Of" always means multiply so:
0.05 x $1500.00 =$75.00
Then, the total cost is the $1500.00 + the sales tax: 1500 + 75 =$1575.00
10% of $1500 is 0.1 x 1500 =$150.00
5% is half of 10%, so half of $150 is$75. So the 5% sales tax adds $75 to the price (1500+75=$1575).