The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17g are added to the box. What is (a) total mass of the box (b) the difference in masses of gold pieces to correct significant figures.

Explanation

Difference in mass of gold pieces = `0.02 g`
In correct significant figure (2 significant fig. minimum decimal) will be 0.02 g.