7th & 8th Grade Consumer Math Quiz

Zack bought 10 measuring tapes. Each measuring tape cost $5.57. How much money did Zack spend?

Answer explanation

$5.57 * 10 = $55.70

Which is a better buy?

• 4-meter piece of cord for $1.82

• 8-meter piece of cord for $3.31

• They are the same price

• Not enough information

Answer explanation

$1.82 ÷ 4 = $0.455 ≈ $0.46

$3.31 ÷ 8 = $0.41375... ≈ $0.41

A 4-pint carton of soy milk costs $5.12. What is the price per quart? There are 2 pints in a quart (2 points)

Answer explanation

($5.12 / 4pint) * (2 pint / 1 quart)

$5.12 ÷ 2 = $2.56

Stefan purchased 2 pounds of chestnuts at $10.12/lb, 3.3 pounds of macadamia nuts at $7.30/lb, and 2.3 pounds of pine nuts at $8.30/lb. What was the total cost? (2 points)

Answer explanation

Find the cost of the chestnuts.

$10.12 × 2 = $20.24

Find the cost of the macadamia nuts.

$7.30 × 3.3 = $24.09

Find the cost of the pine nuts.

$8.30 × 2.3 = $19.09

$20.24 + $24.09 + $19.09 = $63.42

Ava's bill for breakfast at a restaurant was $10.89. She left a 20% tip. What was the total cost of her breakfast, including tip? Don't forget to round to the nearest penny. (2 points)

Answer explanation

$10.89 + ($10.89 * 0.20)

$10.89 + $2.178 = 13.068 ≈ $13.07

OR

$10.89 * (1 + 0.20)

$10.89 * (1.20) = $13.068 ≈ $13.07

Which coupon will save Kaylee more money on a fancy watch originally priced at $875?

• 40% off any one item

• Save $400 on any purchase over $800

• The prices after the coupons are applied are the same

• The coupons don't reduce the price

Answer explanation

A: $875 - ($875 * 0.40) = $525

OR

A: $875 * (1 - 0.40)

$875 * 0.6 = $525

B: $875 - $400 = $475

An accountant is determining the amount of sales tax that his client, a shopkeeper, owes. The client reports that paintings of the beach were sold at a price of $22 and that with sales tax, each one came out to $22.33. What is the sales tax percentage? (3 points)

Answer explanation

%change is (22.33 - 22) / 22 = 0.015 = 1.5%

A tourist map is on sale for 55% off. The price after the sale is $2.43. What was the original price of the map? (3 points)

Answer explanation

$2.43 = x * (1 - 0.55)

$2.43 = x * (0.45)

$2.43 / 045 = x

$5.40 = x

Jared and Casey splurged on a special dinner for their anniversary. Their dinner cost $262.57, and the local sales tax is 4%. If they left a 20% tip on the $262.57, how much in total did they pay? (3 points)

Answer explanation

$262.57 + ($262.57 * 0.04) + ($262.57 * 0.20)

$262.57 + $10.5028 + $52.514

Round:

$262.57 + $10.50 + $52.51 = $325.58

Estimate the amount of the tip by rounding the bill to the nearest dollar before calculating. (2 points)

15% tip on a bill of $66.03

Answer explanation

$66.00 * 0.15 = $9.90