a computer valued at $1500 loses 20% of its value each year.
a) write a function rule that models the value of the computer.
b)find he value of the computer after 3 years.
c) In how many years will the value of the computer be less then $500

Question

a computer valued at $1500 loses 20% of its value each year. 
a) write a function rule that models the value of the computer.
b)find he value of the computer after 3 years.
c) In how many years will the value of the computer be less then $500

tkhunny · Answer

"Loses 20%" is the same as "Retains 80%".  That should help.

anonymous · Answer

$$f(n) = 1500 \times 0.8^{n}$$
f(3)=768
f(x)<500    ->    x=5