Answer:
You would pay $90 now for an item that used to cost $150.
Explanation:
Here's how I thought of it. There are two ways to solve this problem.
Because we know that the item is discounted by 40%, that leaves 60% of its price left. (100% price - 40% price = 60% price).
Thus, you would multiply $150 by 0.6 (or, 60% in decimal form), which equals $90.
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Alternatively, you could also multiply $150 by 0.4 and just subtract what you get from the total. That number is 60, and $150 - $60 = $90.
Use whichever way makes more sense to you!