How much would you pay for a jacket that cost $90 if the rate of sales tax is 8%

C = 90 + 0.08*90 = $97.20.

To calculate the amount you would pay for a jacket with a cost of $90 and a sales tax rate of 8%, you need to multiply the cost of the jacket by the sales tax rate and then add the result to the original cost.

First, calculate the sales tax amount by multiplying $90 by 8% (0.08):
Sales tax amount = $90 * 0.08 = $7.20

Next, add the sales tax amount to the original cost of the jacket to find the total amount you would pay:
Total amount = $90 + $7.20 = $97.20

Therefore, you would pay $97.20 for the jacket with a cost of $90 and a sales tax rate of 8%.