Let's determine which sale is better.
20% means that the shirt will cost:
[tex]120(0.8)=96[/tex]$30 coupon means that the shirt will cost $90
15% off and $15 rebate means:
[tex]120(0.85)-15=87[/tex]10% off and $20 rebate means:
[tex]120(0.9)-20=88[/tex]Comparing the prices we conclude that the best deal is C
