Guess-the-balls test

Hal Spacejock delivers a shipment of antiques, breaking several pieces in the process. His robot, Clunk, skillfully reassembles the broken furniture, and the grateful customer gives them a jar of ancient marbles.
This jar is 60cm (2 feet) high, with a diameter of 36cm (approx 14 inches). It is completely filled with marbles, each of which is 2.5cm (1 inch) in diameter.

Using that information... how many balls does Clunk have?

Enter a number:
If you have no idea... guess!
glassjar.jpg
The jar Clunk was given



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