Answer:
$74.375
Explanation:
1. Calculate how much she received for the first 5 knit hats:
5 * $9.50 = $47.5
2. Calculate how much she received for the sixth and seventh knit hats:
2 * $11.25 = $22.5
3. Calculate how much she received for the eighth and ninth knit hats:
2 * $8.75 = $17.5
4. Add up all her earnings:
$47.5 + $22.5 + $17.5 = $87.5
5. Calculate the 15% of her gross earnings:
$87.5 * 15% = $13.125
6. Subtract the 15% from all her earnings:
$87.5 - $13.125 = $74.375