Jesse G. answered 11/03/15
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To understand this question, you need to break it down:
You are asked the amount of the trade discount. You are told that it is 55% of something, but of what?
There is only one other number mentioned, the list price.
Remember that to calculate a percentage, you multiply the percentage (in this case 55) by the number, and divide by 100.
This problem is like what you might find in a real store: The tag on an item may have one price, but a sign may say "Clearance: 40% off price on tag." If you calculate the percentage, you know how much your discount is.