A budget is about how to spend your money. It is not just an exercise in arithmetic. You have to know how to spend money effectively, to accomplish your objectives (whatever they may be).
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Only three significant figures.
They are congruent. Figures that only have the same size or only have the same shape as each other are "similar".
Two. When multiplying or dividing the answer is rounded to the fewest significant figures in the given measurements. 0.55 has only two significant figures, so the answer can have only two significant figures.
In 25.5 the significant figures are 2,5 and 5 while in 10.09 only 1 and 9 are significant figures.
A number with only 1 significant figure can't be rounded to 3 significant figures