I purchased the 105 Formula Questions.
I'm looking to clarify the answer to question No.73. The answer given is A) 486,300. When I calculate using the correct formulas I get an answer of CPI = 240,000 / 253,700 = 0.9459. Is this ratio that added to the nearest decimal point, i.e. 0.95 ??
Using the answers ratio of 0.946 EAC = 700,000 / 0.946 = 739,957.716
• ETC = EAC – AC = 739,958 – 253,700 = 486,258
If you round off 0.946 to 0.95 you get EAC = 700,000 / 0.95 = 736,842,10
• ETC = EAC – AC = 736,842 – 253,700 = 483,142
I didn't have the question so I took the long route but basically if you use CPI with more decimal places the answer works out. As you noticed rounding the CPI up even one decimal place makes a fairly large difference in the final answer.
You mentioned CPI = 240,000 / 253.700 so that tells me the question gives you the EV as 240,000 and AC as 253,700
You mentioned EAC = 700,000 / CPI which tells me that the question gives you BAC as 700,000
(I now know I didn't need to do that )
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