New Practice Exams (PPD) - Error
I tried out the PPD practice exam that was just released. Question 100 of the exam gives an answer that does not match the math. Which is essence provides the wrong answer. This doesn't help anyone feel content on whether or not they are solving these questions correctly.
I have attached a screenshot of the question and its answer. I would hope that NCARB would review the practice questions and also their actual questions. I would hate to take a real exam and lose a point due to errors in the exam. 
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Hi Jennifer,
Thank you for your post on the PPD practice exam item. You are correct, there is a typo in step 5 of the calculation, however, the answer is correct at 17 years. We have revised step 5 and also added an additional step to further clarify the calculation. Again, thank you for letting us know!
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The new system is going to cost $312,500 to install. If you kept the old system, the cost of operation and maintenance were gonna be $46,875. But with the new system, the operation costs went down by $18,750 (from $46,875 to $28,125).
So every year, by installing this new system, the owner is going to save $18,750. Since they spent an upfront cost of $312,500 to install it, the payback time (from the savings of $18,750/year) can be found by dividing $312,500 by $18,750. Which is almost 17 years. In other words, in 17 years, this system will pay itself off.
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