Question 1040867
You take $145 and multiply it by 0.20 to get $29
That is the amount discounted or "off"
subtract the $29 from the $145 and you get $116.
The question is ambiguous.  You get $29 off, but the final price is $116.  Who writes the question has to be clear on that.  Do they want the discount or the final price, or both?