Final answer:
Michelle can buy a $28 shirt using her $20 cash and the rest from her store credit, or she can use the store credit entirely if it's sufficient, allowing her to save her $20.
Step-by-step explanation:
Michelle can purchase a shirt that costs $28 in two possible ways considering she already has $20 saved and has a store credit. Here are two solutions:
- She can use the $20 she has and apply the remaining $8 from her store credit towards the purchase of the shirt.
- If the store credit is sufficient, she could pay for the entire shirt using the store credit and save her $20 for future use or other purchases.
Both options allow Michelle to acquire the shirt without needing additional cash.