By definition, the elasticity of total cost is the ratio of marginal cost to average cost; for the total cost function TC = 0.4Q2 + 40, find the elasticity of total cost at Q=5, Q=10, and Q=20 units of output. Please show all the steps and briefly explain

The correct answer is c. cost and budget control. Cost and budget control is a performance measure that focuses on the efficient use of resources to achieve predetermined financial goals. If a manager exceeds the monthly marketing budget set for a company, it means that they have failed to control costs and stay within budget limits. This can have a negative impact on the overall financial performance of the organization and reduce its profitability. Therefore, it is important for managers to monitor and control costs to ensure that they are meeting this performance measure.