Final answer:
To find the loss as a percentage of the selling price, subtract the selling price from the cost price, divide the result by the selling price, and multiply by 100. Round the answer to the nearest whole number.
Step-by-step explanation:
To find the loss as a percentage of the selling price, we first need to find the loss. Loss is calculated as the difference between the cost price and the selling price. In this case, the loss would be $12.80 - $9.60 = $3.20.
Next, we calculate the loss as a percentage of the selling price. This can be done by dividing the loss by the selling price and multiplying by 100. In this case, ($3.20 / $9.60) * 100 = 33.33%. Since we need to round to the nearest whole number, the loss as a percentage of the selling price is approximately 33%.
Learn more about Calculating loss as a percentage of the selling price