The mass of a box measured by a grocer's...

The mass of a box measured by a grocer's balance is 2.300kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of the box, (b) the difference in the masses of the pieces to correct significant figures?

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The correct Answer is:

A, B, C

(a) 2.3 kg, (b) 0.02 g

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