Janice and her dad are bullding a treehouse. Her dad boughte box of 155 nails for \( \$ 3.10 \) and a box of 85 screws for \( \$ 7.65 \). How much more do screws cost per piece?

To find out how much more screws cost per piece compared to nails, we first need to determine the cost per piece for each. For the nails: Cost of nails = \( \$3.10 \) for 155 nails Cost per nail = \( \frac{3.10}{155} \approx 0.0200 \) dollars per nail, or \( 2.00 \) cents. For the screws: Cost of screws = \( \$7.65 \) for 85 screws Cost per screw = \( \frac{7.65}{85} \approx 0.0900 \) dollars per screw, or \( 9.00 \) cents. Now, to find the difference: \( 9.00 \) cents (screw) - \( 2.00 \) cents (nail) = \( 7.00 \) cents. So, screws cost \( 7.00 \) cents more per piece than nails.