b) AEF does additional analysis and learns that customers making similar amounts of total annual purchases make different numbers of individual purchases annually. For example, one customer it earns $1,000,000 in revenue from annually makes 24 purchases a year while another customer it earns $1,000,000 in revenue from annually makes 4 purchases a year. What does this imply about allocating customer service overhead costs as a percentage of annual sales revenue derived from the customer? Why does it imply this?