Answer:The answer is a. sales tax.Here's why: * Sales tax: This is a percentage added to the price of goods and services. It increases the total cost. * Discount: This is a percentage reduction in price, leading to a lower total cost. * Loss: This refers to a decrease in value or quantity, which is not a percentage increase. * Depreciation: This is a decrease in the value of an asset over time, again not a percentage increase.Therefore, sales tax is the only option that describes a percentage increase.