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Math  /  Numbers & Operations

QuestionA. Write the expressions and answer to each question.
1. The original price of a calculator is $300\$ 300. It is now sold at $270\$ 270. What is the percentage discount? \qquad \qquad
2. The original price of a jacket is $1000\$ 1000. John saved $240\$ 240 with the discount. What is the percentage discount? \qquad \qquad
3. The original price of a pair of socks is $20\$ 20 and it is sold after a deduction of $5\$ 5. What is the percentage discount? \qquad \qquad

Studdy Solution

STEP 1

1. 需要計算每個問題中的百分比折扣。
2. 百分比折扣的計算公式為：百分比折扣=(折扣金額原價)×100%\text{百分比折扣} = \left(\frac{\text{折扣金額}}{\text{原價}}\right) \times 100\%。

STEP 2

1. 計算計算機的百分比折扣。
2. 計算夾克的百分比折扣。
3. 計算襪子的百分比折扣。

STEP 3

計算計算機的折扣金額：
折扣金額=$300−$270=$30\text{折扣金額} = \$300 - \$270 = \$30

STEP 4

計算計算機的百分比折扣：
百分比折扣=($30$300)×100%=10%\text{百分比折扣} = \left(\frac{\$30}{\$300}\right) \times 100\% = 10\%

STEP 5

計算夾克的百分比折扣：
百分比折扣=($240$1000)×100%=24%\text{百分比折扣} = \left(\frac{\$240}{\$1000}\right) \times 100\% = 24\%

STEP 6

計算襪子的折扣金額：
折扣金額=$20−$5=$15\text{折扣金額} = \$20 - \$5 = \$15

STEP 7

計算襪子的百分比折扣：
百分比折扣=($15$20)×100%=75%\text{百分比折扣} = \left(\frac{\$15}{\$20}\right) \times 100\% = 75\%
計算結果：
1. 計算機的百分比折扣是 10%10\%。
2. 夾克的百分比折扣是 24%24\%。
3. 襪子的百分比折扣是 75%75\%。

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