15. (5 Points) You are the business manager for a dermatological practice. The dermatologist has asked you to estimate customer lifetime value for your firm's typical customer. Calculate customer lifetime value for a new customer: 16. (3 Points) Continuing with the previous question, how much money can the practice afford to spend to increase customer retention from 70 to 75% ? 15. (5 Points) You are the business manager for a dermatological practice. The dermatologist has asked you to estimate customer lifetime value for your firm's typical customer. Calculate customer lifetime value for a new customer: 16. (3 Points) Continuing with the previous question, how much money can the practice afford to spend to increase customer retention from 70 to 75%