First, we have to figure out what percentage of the price Willem is going to pay.
Since it is 40% OFF, he will have to pay 60% if the price.
60% in decimal form is 0.6. To get 60% of 60, multiply 60 by 0.6. 60 * 0.6 = 36.
So, Willem will pay 36$ for the jacket when it's on sale.
I hope this helps! Can I have Brainliest, please? :)