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We know we have 4 bills part of the annual expenses. Paying a bill in full represents a 1. So paying 100% should equal 4.
I have paid the following of bill A,B,C,D
A = 1/2 B = 1/2 C = 1/4 D = 3/4
That totals 8/4.
(8/4) / 4 = 2/4 = .5 * 100 = 50% of the annual bills paid.
This Is very clever problem.
The problem is testing your understanding of averages. As long as you choose the same numbers as plug-ins for C,D the outcome will be 50%, since 1/4 and 3/4 are completing. (i.e. C = 100, D = 100)
Only when you start pluging in diffrent numbers for C,D the outcome will be different then 50%. (i.e. C = 150, D = 100)
The writer of this problem assumes that a test taker with a good grip on averages will choose (E) either by useing algebra or logic, but a weaker test taker will plug in numbers (and in a hurry) and will choose the same numbers for C,D and eventually choose (C).
So basically, we cannot add these and because we do not know what the total bill amount is, correct? If we know the total bill was $100 then this could be solved with C?
Agree here with the others. Put simply, this is a weighted average question but you don't know the weights. Essentially, you need to know the ratio of all the bills, and you could do it. But without that, you just can't.