A company manufacturers and sells two types of products and the cost of production of each unit a and b is rupees 200 and 150 respectively each unit of product yields a profit of 20 rupees and each unit of product b yields a profit of 15 rupees on selling. The company estimates the monthly demand of A and B to b at a maximum of the harvested unit in all the production budget for the month is set at rupees 50000. 

How many units should the company manufacture in order to earn maximum profit from its monthly sales from a and b? Solve this problem using linear programming.