What is the ratio of LTV to CAC for the sale of software sold by a company with the following information?

The total cost of obtaining 40 leads that will result in one sale is $2500

The total cost of negotiting and finalizing a sale is $2000

The annual subcription fee is $4000 paid at beginning of each year.

The customer attrition rate is 10% from year 1 to year 2 and 10% from year 2 to year 3

Only consider subscription fee for three years.

The margin on the subscription is 100%.

The discount rate is 20%.

Express your answer to two decimal places e.g. 4.26