Final answer:
Kelly received a 25 percent discount on a $420 bicycle, amounting to a $105 discount when calculated using the discount = original price * (discount rate/100) formula.
Step-by-step explanation:
Kelly received a 25 percent discount on a $420 bicycle. To calculate the amount of the discount, we use the formula: discount = original price * (discount rate/100). In this case, the original price is $420 and the discount rate is 25%.
To find the amount of the discount:
- Convert 25% to a decimal by dividing it by 100, which gives 0.25.
- Multiply the original price of the bicycle by the decimal discount rate: $420 * 0.25.
- This calculation gives us the discount amount, which is $105.
Therefore, the amount of the discount that Kelly received was $105.