Final answer:
The amount saved on a cell phone that costs $300 with a 10% discount is $30. This is calculated by multiplying the original price by the discount rate of 10%.
Step-by-step explanation:
To find the amount saved on a cell phone that originally costs $300 with a 10% discount, we calculate 10% of $300. To do this, we use the formula: Discount = Original Price × Discount Rate. Therefore, the calculation is:
Discount = $300 × 0.10
Discount = $30
So, you save $30 on the cell phone, which makes the correct answer B) $30.