It is given in the question that ,
The price per share of a stock changes by -$4.50 on each of 5 consecutive days.And the starting price of the share is $67.50.
Therefore, after first day, the price of share is

Price of share after second day

Price of share after third day is

Price of share after fourth day is

And price of share after fifth day is

And that's the price of the share after 5 consecutive days .