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.
• What is Mary's total investment in America Bank?
• After four years, how many shares does Mary own?
• What is the average cost per share of Mary's investment?