Constant returns to scale is when a proportional increase in inputs such as capital and labour cause the same proportional increase in output. Constant returns to scale occurs when an increase in number of inputs leads to an equivalent increase in the output.
From the question, to determine the cost of producing 500 units;
A core competency is a concept in management theory introduced by C. K. Prahalad and Gary Hamel. It can be defined as "a harmonized combination of multiple resources and skills that distinguish a firm in the marketplace" and therefore are the foundation of companies' competitiveness.