Martin went to a store to buy a new television set. He decided to spend no more than $1,000 and the sales clerk offered him the TV for $100 less and an additional 20% off. How much lower was the price of the television than the amount Martin decided to spend? Let's think first. Chain of thought:
The seller has offered him the TV for 1000 - 100 = $900. The discount on the television was 900 * 20 / 100 = $180. The final price of the television is therefore 900 - 180 = $720. Martin was able to save 1000 - 720 = $280.
Therefore, the answer is 280.