Up to the significant figures introduction.

How Much Is The Gold Worth?

Let us suppose that gold is selling today for $25.06 per gram.

This is a 4-decimal balance. It is a high precision and very expensive instrument. It can measure extremely small changes in the amount of gold in the balance pan.

On the 4-place balance, the gold weighs 1.6431 g.

There are 5 significant figures in our measurement.

The gold is worth

25.06 ($/g) x 1.6431 (g) = $41.16

A similar example
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