c. A command button that, when clicked on, performs a Pareto analysis using the algorithm described below and presents the corresponding results. Pareto analysis is used very often to identify product/process quality problems. This analysis indicates that 20% of the reasons cause 80% of the quality problems. In here we describe the steps one should follow to complete the Pareto analysis: (i) calculate the total number of returns; (ii) for each cause of return, calculate the total number of customers that have selected it as the primary cause of return; (iii) for each cause of return, calculate the percentage of returns, sort the information in descending order of the percentage return, and calculate the cumulative percentages; (iv) repeat steps (i) to (iii) for the secondary and tertiary causes of return