Answer:
$30.23 paid in total
Charge $3.03 per bag and sell 10 bags to get your money back
Explanation:
49.95 - 49.95(0.45) = 27.48
27.48 + 27.48(0.10) = 30.23 is what you paid for the 20-bag box
30.23/10 = 3.03 is what you need to charge per bag x 10 bags to get your money back. 3.03 x 10 ≈ 30.23