A firm makes two types of furniture : chairs and tables. The contribution to profit for each product as calculated by the accounting department is $Rs.20$ per chair and $Rs.30$ per table. Both products are to be processed on three machines $M_{1}, M_{2}$ and $M_{3}$. The time required in hours by each product and total time available in hours per week on each machine are as follows: Machine Chair Table Available Time $M_{1}$ $3$ $3$ $36$ $M_{2}$ $5$ $2$ $50$ $M_{3}$ $2$ $6$ $60$ Which manufacturer gained more profit?