Answer:
$8.10 in profit
Explanation:
First convert from yards to feet. 50 yards is equal to 150 feet. To find the unit price for how much they bought it for divide $13.50 / 150 to find that they bought the satin for 9 cents a foot.
Next find how much they sold it for. To find this divide $0.80 / 5 to find that they sold the satin for 16 cents a foot.
To find the profit for 45 yards, convert 45 yards to feet which is 135 feet. Then multiply this by the unit price for sales, 135 * $0.16 to get $21.60
To find the profit subtract the amount they spent on the fabric by the amount they made.
21.60-13.50 = $8.10