Question

Joel wants to buy a new tablet computer from a store having a 20% off sale on all tablets. The tablet he wants has an original cost of 190$. He also wants to make sure he has enough money to pay 5% sales tax. Joel uses the incorrect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of 144.40. Describe his error and write his correct expression.

Answer 1

he is correct

Explanation:

190-20%=152

152-5%=144.40

Answer 2

90 *.80 *(1.05)

Instead of adding the sales tax, he subtracted the sales tax.

159.60

Explanation:

If Joel gets 20% off, he still has to pay (100-20) or 80%

The cost of the tablet is now 190 * .80

Then he has to pay 5% sales tax.

The tax is the prices times 5% plus the original price

190 *.80 *(1+.05)

or 190 *.80 *(1.05)

Instead of adding the sales tax, he subtracted the sales tax.

The total he needs to pay is

190 *.80 *(1.05)

159.60

Explanation: