Question

At the school carnival, students guessed how many marbles are in a jar. Marlo guessed 84 when it was actually 80. What percent of error did Marlo have?

Answer 1

5%

Explanation:

Percent of error =
`(84-80)/(80)` × 100%

= 5%

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Lexi and Ann went shopping. Ann wondered how much tax she would have to pay on her purchase of $76. Lexi said, "They just charged me $17 in taxes when I bought these outfits for $200." How much will Ann pay in taxes?

Ann's taxes =
`(17)/(200)` × $76

= $6.46

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Every week Roseanne gets paid $100 plus a 5% commission on all of her sales. If she has $5,000 in sales, how much is her pay for the week?

5% commission =
`(5)/(100)` × $5000

= $250

Total pay = $250 + $100

= $350

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Every week Kabore gets paid $100 plus 5% of his sales. How much does he need to sell if he wants to make $700 this week?

Amount of commission paid = $700 - $100

= $600

5% of sales = $600

100% of sales =
`(100)/(5)` × $600

= $12 000

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Get-It-Done Depot has an ad for piping that reads:

“15 inches of pipe - only $2.00

Get 15% off the total when you buy more than 3 feet”

Mike needs 4 feet of piping. How much will it cost him?

4 feet = 48 inches

48 inches -
`(48)/(15)` × $2.00 = $6.40

Total after 15% off (since 4 feet is more than 3 feet so the discount is legible) -
`(100-15)/(100)` × $6.40 = $5.44