Calculation tricks

Question 1

Rule of 72

Answer 1

Any number growing at x% rate, doubles itself in 72/x years

Question 2

LTV of a user

Answer 2

Lifetime = 1/churn rate . Eg. if churn = 20%, LTV = 5 Years

Question 3

Segmentation for individual usage

Answer 3

0-20 (80M)
20-40 (80M)
40-60 (80M)
60-80 (80M)

Question 4

Segmentation for household usage

Answer 4

3M /3 => 100M households

Question 5

Segmentation by income level

Answer 5

Highlevel : 10%
Mid level : 60%
Low level : 30%