Final answer:
The selling price of the television with a 40% markup is calculated by adding the markup amount ($128) to the cost price ($320), resulting in a selling price of $448.
Step-by-step explanation:
To calculate the selling price of a television with a 40% markup, we first determine the markup amount by multiplying the cost price by the markup percentage. The cost price of the television is $320, so the markup amount would be $320 × 40% = $320 × 0.40 = $128. To find the final selling price, we add the markup amount to the cost price, which gives us $320 + $128 = $448. Therefore, the selling price of the television after applying a 40% markup would be $448.