12 For four years, Mary Nations Invested $4,000 each yeer in America Bank stock. The stock wes seilling for $34 In 2013, for $48 In 2014, for $37 in 2015, and for $52 In 2016 71 ints (a) What is Mary's total Investment in America Bank? eBook a(b) After four years, how many shares does Mary own? (Round your Intermediate calculations and final answer to 1 decimal place. Print Total shares References c) What is the average cost per share of Mary's investment? (Round your Intermedlate calculations and final answer to 1 decimal place.) Average cost per share