1. Calculate the markup based on the cost:
\text{Markup} = 8 \times 0.50 = 4
2. Add the markup to the cost to find the retail price:
\text{Retail Price} = 8 + 4 = 12
3. Calculate the discount based on the retail price:
\text{Discount} = 12 \times 0.30 = 3.6
4. Subtract the discount from the retail price to find the sale price:
\text{Sale Price} = 12 - 3.6 = 8.4
The retail price is 12 and the sale price is 8.4 .