Read the following passage carefully and give the answer of the questions.
When you buy a car, examine carefully the important features of the model you are considering. Many a buyer of the latest model has got into trouble by buying  a car too broad or too long for his garage. Further more, a long car is too hard to manage in traffic and too difficult to park. Another feature is the comfort afforded. Are the seats nice and durably upholstered? Is there enough glass to give the driver a god view in all directions, particularly to the rear? It should be remembered that the heavier and the powerful car is, the more expensive it will be to operate. High powered motors, require expensive high-octane petrol. The greater weight means greater tyre wear and enlarged brakes. The old cliche is still true, it is not the initial cost but the upkeep which matters.
According to this passage, the two factors that the buyer of a new car should keep in mind are

Find the missing number?

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What is the scope of decision making?

Find the missing number.
10, 100, 200, 310, ?