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?

`2.34032kg`

`2.34kg`

`2.3kg`

`2.340kg`

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The correct Answer is:

Total mass=`(2.300+0.02015+0.02017)kg`
`=2.34042kg`
As the least number of significant figures in the mass of box is 2, so maximum number of significant figures in the result can be 2.
`therefore`Total mass=2.3 kg.

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