Purple Corporation, a calendar year taxpayer, began operations in 2015. It reported the following amounts for its first four tax years. Calculate Purple's positive and negative ACE adjustments for each year.
_________________ Unadjusted AMTI __________ ACE
2015 ................. $85,000,000 ............... $70,000,000
2016 ................. 70,000,000 ................. 90,000,000
2017 ................. 54,000,000 ................. 40,000,000
2018 ................. 60,000,000 ................. 20,000,000