xample $2$ ABC Ltd provides following information: The company has three groups of buyers. Class A Heavy Users, there are $500$ heavy users and desired call frequency is $10$ calls a year. Class B $-$ Medium Users with $2000$ medium users and desired call frequency is $6$ calls a year. Lastly, the Class C with $5500$ light users and call frequency is $4$ calls a year. Based on experience and study, a company has concluded that in an industry an average salesmen can make $1000$ calls in a year. What is the Salesforce size?