Question

Don’t know how to solve.

Answer 1

$122.88

Explanation:

the phone decreases by 20% each year , that is

(100 - 20)% = 80% =
`(80)/(100)` = 0.8

the phone reduces by a factor of 0.8 each year , then after 4 years

value = $300 ×
`(0.8)^(4)` = $122.88