Tom needs to buy a new gaming system. He trades in his super Nintendo for an original NES. The SNES is worth $150 and the store gives him 80% of that value. He gives $80 and gets back $10 change and a game worth $30. How much was the NES on sale for?
Let's be accurate as possible. Think before you answer.
160
He traded in the SNES for 150 *.

8 = $120.

Including the money he gave, he spent 120 + 80 = $200.

He got 10 + 30 = $40 in change.

So the NES cost 200 - 40 = $160.

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The answer is 160