Let’s solve each part step by step.
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Part A: Find the sales tax using the given original price and the sales tax rate.
Sales tax = Original Price × Sales Tax Rate (as a decimal)
1) Original price = $1,250; Sales tax rate = 6%
→ 6% as a decimal = 0.06
→ Sales tax = 1250 × 0.06 =
$75
2) Original price = $500; Sales tax rate = 2.5%
→ 2.5% as a decimal = 0.025
→ Sales tax = 500 × 0.025 =
$12.50
3) Original price = $469; Sales tax rate = 5%
→ 5% as a decimal = 0.05
→ Sales tax = 469 × 0.05 =
$23.45
4) Original price = $41,000; Sales tax rate = 9%
→ 9% as a decimal = 0.09
→ Sales tax = 41000 × 0.09 =
$3,690
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Part B: Calculate the total cost after including the sales tax.
Total Cost = Original Price + Sales Tax
OR
Total Cost = Original Price × (1 + Sales Tax Rate as decimal)
1) Stapler costs $12; Sales tax rate = 1%
→ 1% = 0.01
→ Total cost = 12 × (1 + 0.01) = 12 × 1.01 =
$12.12
2) TV costs $105; Sales tax rate = 7%
→ 7% = 0.07
→ Total cost = 105 × (1 + 0.07) = 105 × 1.07 =
$112.35
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Part C: What is the sales tax if the original price is $2,400 and the sales tax rate is 3.5%?
→ 3.5% as a decimal = 0.035
→ Sales tax = 2400 × 0.035 =
$84
Check:
2400 × 0.03 = 72
2400 × 0.005 = 12
72 + 12 = 84 → Correct!
So the answer is
a) $84
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Final Answer:
A) 1) $75 2) $12.50 3) $23.45 4) $3,690
B) 1) $12.12 2) $112.35
C) a) $84
Parent Tip: Review the logic above to help your child master the concept of 7th grade math sales tax worksheet.
