Bhagwati Enterprises is a company engaged in the marketting of air-conditioners of a famous brand. The company has a functional structure with the four main functions purchase. Sales. Finance and Staffing. As the demand for the product grew. The comapnay decided to recruit more employees. Identify the concept which will help the Human resource Manager to find out the number and type of personnel available so that he could decide and recruit the required number of persons for each department.