I believe A and B are the ones. As for explaining? hmm. I would honestly say that any number to the right of a number is a tenth of the place above it. But then again, it's optional to explain ;P
Given:
Dimensions are 7 ft by 5 ft by 8.5 ft
Contents weigh 0.21 pound
Contents worth $8.80 per pound
Find-: value of container contents.
Sol:
Volume is:

The formula of density is:

So,

Now $8.80 per pound
For 62.475 pounds the value is:

So the value of the container contents is 549.78
Answer: Answer: 2.1 %
Step-by-step explanation:
Decrease = initial price - final price
% decrease = [ (initial price - final price) / initial price ] *100
% decrease =[ (2.89 - 2.83) / 2.89] * 100 = 2.08, which can be rounded to 2.1