For four years, Mary Nations invested $2,850 each year in America Bank stock. The stock was selling for $37 in 2013, for $48 in 2014, for $44 in 2015, and for $55 in 2016 (a) What is Mary's total investment in America Bank? Total investment (b) After four years, how many shares does Mary own? (Round your intermediate calculations and final answer to 1 decimal place.) Total shares (c) What is the average cost per share of Mary's investment? (Round your intermediate calculations and final answer to 1 decimal place.) Average cost per share