Final answer:
To find the discount on a $23.99 box of diapers at 10% off, multiply $23.99 by 0.10 to get $2.399; rounding to the nearest cent, the discount is approximately $2.40. The sale price is then $23.99 minus $2.40, resulting in $21.59.
Step-by-step explanation:
The student has asked to find the approximate amount of the discount for a box of diapers with a regular price of $23.99 when it is on sale for 10% off. To calculate the discount, we multiply the regular price by the discount rate, which has been converted to a decimal (0.10). To find the discount, we calculate $23.99 × 0.10 = $2.399. Rounding this to the nearest cent, the discount is approximately $2.40. This means that the sale price of the box of diapers will be the regular price minus the discount, which calculates to $23.99 - $2.40 = $21.59.