1. **Problem Statement:** Calculate the retail price by marking up the cost by a given percentage for the first product: Sunkist priced at 78 with a 10% markup. 2. **Formula:** Retail Price = Cost + (Markup Percentage × Cost) = Cost × (1 + Markup Percentage) 3. **Calculation:** $$\text{Retail Price} = 78 \times (1 + 0.10) = 78 \times 1.10$$ 4. **Intermediate step with cancellation:** $$\text{Retail Price} = \cancel{78} \times 1.10 = 85.8$$ 5. **Explanation:** We multiply the original price by 1 plus the markup rate (expressed as a decimal) to find the final retail price. 6. **Final answer:** The retail price for Sunkist is **85.8**.