For four years, Marie invested $$3,300$ each year in a bank$$s stocks. The stocks sold for $$37$ in $20$X$1,$ $$53$ in $20$X$2,$ $$45$ in $20$X$3,$ and $$55$ in $20$X$4.$

a$.$ What is Marie$$s total investment in this bank? $($Omit the $"$$$"$ sign in your response.$)$

Total investment $

b$.$ After four years, how many shares does Marie own? $($Round your intermediate calculations DOWN and round your final answer DOWN to the nearest whole share.$)$

Total number of shares

c$.$ What is the average cost per share of Marie$$s investment? $($Round DOWN your intermediate calculations to the nearest whole share. Round your final answer to $2$ decimal places. Omit the $"$$$"$ sign in your response.$)$

Average cost per share $