Percentages - Math Problem

Question

Isabelle buys a volleyball net priced at $25.20.If the sales tax is10%,what will be the total cost including tax?

Answer 1

Another way to get the answer is to think about the $25.20 as 100% of the cost and the tax as 10% of the cost. So you pay a total of 110% (1.10)

$25.20(1.10) = $27.72. Don't need intermediate step of calculating the amount of the tax.

Algebraically it looks like 25.20 + 0.10(25.20). Factor out the 25.20 and get 25.20 (1 + 0.10) = 25.20(1.10).

Answer 2

The original cost without tax is $25.20. If the sales tax is 10%, we need to change that into a decimal to better solve the problem. 10% becomes 0.1 (move the decimal 2 places to the left). Take the tax rate and multiply it by the original price.

$25.20 x 0.1 = $2.52

Notice that this doesn't give you the actual price. This gives you the amount of tax only. So, take the original price and add the tax and that is your answer with tax included!

$25.20 + $2.52 = $27.72

Answer 3

Total cost = original cost + tax

To calculate tax, multiply (cost)(tax rate) The tax rate should be the percentage as a decimal

10%/100 = 0.10 as a decimal

Total cost = 25.20 + 25.20(0.10)

Total cost = 25.20 + 2.52 = $27.72