Final answer:
Christina will pay $28 for the toaster during the sale after applying a 30% discount on the original price of $40.
Step-by-step explanation:
Christina wants to buy a toaster with an original price of $40, during a sale with a 30% discount. To calculate the sale price, we first determine the amount of the discount by multiplying the original price by the percentage of the discount, expressed as a decimal.
To convert the discount rate to a decimal form, we divide 30 by 100, resulting in 0.30. Then we calculate the discount amount: $40 × 0.30 = $12. This means the discount is $12 off the original price.
Next, we subtract the discount amount from the original price to find out the sale price Christina will pay: $40 - $12 = $28. So, Christina will pay $28 for the toaster during the sale.