Answer:
The number of bicycle the store sell each month is 35 .
Explanation:
Given as :
The cost of the bicycle store to operate = x = $4200 per month
The store pay an average cost of = y = $75 per bike
The average selling price of each bicycle = s.p = $195
Let The number of bicycle sell by store each months = n
Now, According to question
The rest amount for each bicycle = The average selling price of each bicycle - The store pay an average cost of
I.e The rest amount of each bicycle = s.p - y
Or, The rest amount of each bicycle = $195 - $75
Or, The rest amount of each bicycle = $120
Again
The number of bicycle sell by store each months =

Or, n =

∴ n = 35
So, The number of bicycle the store sell each month = n = 35
Hence , The number of bicycle the store sell each month is 35 . Answer