self Maths Puzzle

There are 100 marbles with a seller. In how many minimum number of bags he has to pack it separately so that he can give the marbles to the customers without counting it...........
He has to give the required number of marbles to customer without counting them once again when a customer asks him(between 1 to 100)

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self Other Question
You've been asked to buy 100 buttons, using 100 rs to do so. You may buy no more or less than 100 buttons, and the total price must be exactly 100 rs. There is no sales tax. Red buttons cost Rs6.00. Yellow buttons cost Rs3.00. Blue buttons cost Rs 0.10. How many of each must you buy? Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den