Final answer:
To find the total cost of the jacket with sales tax, multiply the original price by the sales tax rate and add it to the original price.
Step-by-step explanation:
To find the total cost of the jacket, we need to calculate the sales tax and add it to the original price. First, we find the amount of sales tax by multiplying the original price ($85) by the sales tax rate (7.5% or 0.075). 85 x 0.075 = $<<85*0.075=6.375>>6.375. So, the sales tax is $6.375. To find the total cost, we add the original price and the sales tax: $85 + $6.375 = $<<85+6.375=91.375>>91.375.