1. **Problem:** Office Products has a box of 250 binder clips on sale for 9.99. The list price is 10.99. If you buy 4 boxes, find (a) sale price, (b) amount you save, and (c) total purchase price including 6.75% sales tax. 2. **Formula and rules:** - Sale price for multiple boxes: multiply sale price per box by number of boxes. - Amount saved: difference between list price and sale price per box, multiplied by number of boxes. - Total purchase price with tax: multiply sale price by (1 + tax rate). 3. **Calculations:** (a) Sale price for 4 boxes: $$4 \times 9.99 = 39.96$$ (b) Amount saved: $$\text{Savings per box} = 10.99 - 9.99 = 1.00$$ $$\text{Total savings} = 4 \times 1.00 = 4.00$$ (c) Total purchase price including tax: $$\text{Tax rate} = 6.75\% = 0.0675$$ $$\text{Total price before tax} = 39.96$$ $$\text{Total price with tax} = 39.96 \times (1 + 0.0675) = 39.96 \times 1.0675$$ $$= 42.66$$ 4. **Answer:** - (a) Sale price for 4 boxes is 39.96 - (b) Amount saved is 4.00 - (c) Total purchase price including tax is 42.66