A cellphone provider$$s average phone bill is $$21\mathrm{.}80$ per month. It has two variable costs, including $$4$ account per month for maintenance and $$3$ for marketing per year. Its customer attrition is $\mathrm{.}65\%$ per month. The company also has an average monthly discount rate of $2\%.$ Answer the following questions $(10$ points each$).$

$1.$ How much is the company$$s average CLV$?$

$2.$ What happens to the CLV if the company reduces the maintenance costs by $$1$ per month and $$1$ for marketing, with all other things unchanged? What happens to the CLV if the company reduces the customer attrition to $\mathrm{.}5\%$ per month?

$3.$ Between reducing costs vs reducing attrition, discuss which one the company should focus, and why?