It isn't clear what the question is. If you are supposed to multiply or divide, and if by "signification figures" you mean significant digits, do the multiplication (or division), then round to three significant digits - since the least-precise of the numbers only has three significant digits.
Because otherwise you are using figures which imply an accuracy that cannot be justified.
2 we have a answer ..
63.7
You can write a word problem a few different ways using these numbers. If you have 480 seats and only 211 people how many seats would you have left?
There are great advantages and disadvantages to using sales figures. Advantages to using sales figures is to help with projections of sale for future years. The disadvantages of using sales figures is the market is volatile.
145.992 using only four significant figures is 146.0
21,600 using only four significant figures is still 21,600.
All geometric figures.
840 using four significant figures is 840.0
Dream on. There is nothing. The state figures that you use it and if you abuse it then it is your problem. The only help is when a store or credit card company mistreats you according to federal credit laws. Then, you have to go through a process of proving what they did, fill out the forms for the proper agency, and fight the credit card.
List of proper ways of using computers?
It might have been possible to answer the question if the "following" multiplication had followed. But since you did not bother to make sure that it did, I cannot provide a more useful answer.