For four years, Marty Campbell invested $$7,500$ each year in Harley$-$Davidson. The stock was selling for $$78$ in $2014,$$$62$ in $2015,$$$50$ in $2016,$ and $$56$ in $2017.$

a$.$ What is Marty's total investment in Harley$-$Davidson?

Total imvestment

b$.$ After four years, how many shares does Marty own? $($Do not round intermediate calculations. Round your answer to $1$ decimal place.$)$

c$.$ What is the average cost per share of Marty's investment? $($Use the rounded number of shares computed in part b$.$ Round your answer to $2$ decimal places.$)$

Average cost per share