Final answer:
To find the amount of sales tax on a $200 dress with a 5% sales tax rate, multiply $200 by 0.05.
Step-by-step explanation:
To find the amount of sales tax, we need to multiply the cost of the dress by the sales tax rate. In this case, the dress cost $200 and the sales tax rate is 5%.
We convert the sales tax rate to a decimal by dividing it by 100: 5/100 = 0.05.
Then, we multiply the dress cost by the sales tax rate: $200 * 0.05 = $<<200*0.05=10>>10.
Therefore, Shelby had to pay $10 in sales tax.