Final answer:
To calculate the cost of overnight shipping based on weight, multiply the weight of the item in pounds by $0.25 and add it to the fixed fee of $10.00.
Step-by-step explanation:
To calculate the cost of overnight shipping based on weight, you need to use the given $0.25 additional fee for each pound. Start with the fixed fee of $10.00 and then multiply the weight of the item in pounds by $0.25. Finally, add the result to the fixed fee to get the total cost.
For example, if the item weighs 3 pounds, the additional fee would be 3 * $0.25 = $0.75. Adding this to the fixed fee of $10.00, the total cost would be $10.00 + $0.75 = $10.75.
Similarly, if the item weighs 5 pounds, the additional fee would be 5 * $0.25 = $1.25. Adding this to the fixed fee of $10.00, the total cost would be $10.00 + $1.25 = $11.25.