Answer:
Cost of Tammy's lunch box before tax = $9.571
Explanation:
Let the cost of Tammy's lunch box before tax be =$

Sales tax charged = $0.727
Sales tax rate =7.596%
Sales tax charged in terms of will be = 7.596% of the Original cost of lunch box
So, we have,

Dividing both sides by


∴

∴ Cost of Tammy's lunch box before tax = $9.571