Problem
For four years, Mary Thomas invested $4,080 each year in America Bank stock'. The stock was selling for $56 in 2018, for $52 in 2019, for $53 in 2020, and for $45 in 2021.
i. What is Mary's total investment in America Bank?
ii. After four years, how many shares does Mary own?
iii. What is the average cost per share of Mary's investment?