Aubrey found an awesome deal on a new backpack when she went back-to-school shopping. The backpack originally cost b dollars, but it was on sale for 75% off.
Pick all the expressions that represent the sale price of the backpack.
1. 0.75b
2. b - 0.75b
3. (1 - 0.75)b
4. 0.25b
5. b/4