Question

Due to ever-changing technology, a new XYZ Smartphone decreases in value 20% each year. (a) How much will this $1000 phone be worth in 2 years? (b) How long until it is worth less than 10% of it's original price?

Answer 1

1.) $640 2.) 7 years.

Explanation:

1000 x .2 = 200 1 yr

1000 - 200 = 800

800 x .2 = 160 2 yrs

800 - 160 = 640

640 x .2 = 128 3 yrs

640 - 128 = 512

ANYWAYS THIS WOULD TAKE TO LONG! SO HERE IS THE ANSWER TO B.