Final answer:
To find the total cost of a shirt with sales tax, multiply the price by the tax rate and add the result to the original price.
Step-by-step explanation:
To calculate the total cost with sales tax, we need to add the tax amount to the original price. To find the tax amount, we multiply the sales tax rate (5%) by the price of the shirt ($50). The result is $2.50. Adding this tax amount to the original price gives us a total cost of $52.50.
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