Question: A parking garage of a mall is four stories tall. On the first level, there are 90 parking spaces. The second level has 8 more parking spaces than on the first level, and there are 12 more available parking spaces on the third level than on the second level. The fourth level has 9 fewer parking spaces than the third level. If 100 cars are already parked, how many cars can be accommodated by the parking garage? Think carefully first, then make a decision:
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The second level has 90 + 8 = 98 parking spaces. The third level has 98 + 12 = 110 parking spaces. The fourth level has 110 - 9 = 101 parking spaces. So the parking garage can accommodate 90 + 98 + 110 + 101 = 399 cars. Thus, the parking garage can still accommodate 399 - 100 = 299 cars. So the answer is 299.
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