You want to buy a new app for your iPhone that costs $2.50. The tax rate is 4%. How much total do you pay for the app?

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  $2.60

Step-by-step explanation:

You pay ...

  app cost + tax

  $2.50 + 4% × $2.50 = $2.50×(1 + 4%) = 1.04×$2.50 = $2.60

You pay $2.60 for the app.

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation: