b. Sales and marketing expense to revenue (2 mark) 2. Assume the average customer sale in 2019 is $45.00 and $40 in 2018, and customers on average purchase twice per year. a. How many customers would JB HiFi have served in 2019 and 2018? (2 marks) b. Assume that 20% of customers are new customers, how many new customers did they have in both years? (2 marks) C. Assume customers have a lifetime of 5 years, what is the customer lifetime value (use the 2019 values)? (2 marks) 3. Based on the information calculated write a 150 word summary interpreting the information. (5 marks) 4. What three (3) conclusions would you make based on the information obtained? (3 marks) 5. What recommendations would you make based on your conclusions? (2 marks)