87. No person shall carry on or keep a public laundry unless a license to that effect has been issued to him, upon payment of the following duty:
(1) In the cities of Montréal, Westmount and Outremont, fifty dollars;
(2) In the city of Québec, forty dollars;
(3) In any other city, twenty-five dollars;
(4) In any town, twenty dollars;
(5) Elsewhere, fifteen dollars.