The genuine mass of the beaker might be very different. Hence there are 3 significant figures. We can do it by employing considerable figures. The region of the representation that includes the vital figures (instead of the base or the exponent) is referred to as the significant or mantissa. It's too many major figures. This usually means you MUST know how to recognize important figures to be able to use this rule. But there are just two significant figures in the cost of copper, hence the last answer can just have two significant figures.
