a laptop is worth 2800. each year its value is 65% of its value the year before. After how many years will the laptop computer be worth 400 or less?

Question

write the smallest possible whole number

Answer 1

After 1 year the laptop will be worth 0.65*2800 = 1820

After 2 years the laptop will be worth 0.65*1820 = 0.65*(0.65*2800) = 0.65²*2800 = 1183

After 3 years the laptop will be worth 0.65*1183 = 0.65*(0.65²*2800) = 0.65³*2800 = 768.95 

After 4 years the laptop will be worth 0.65⁴*2800 = 499.8175

After 5 years the laptop will be worth 0.65⁵*2800 ~ 324.88