question 53 Its the zombie apocalypse there are currently 25

question 5,3

Its the zombie apocalypse. there are currently 25 zombies. the number of Infected zombies triple every hour. How long will it take for the number 0f zombies to Increase to 2025? ABC manufacturing Company purchase a new machine valued at $25,000. If the machine depreciates at a rate of 6% normally, after how many years will the value of the machine depreciate to approximate $13, 465? the number of colonies of bacteria in culture doubles in number every 8 hours. There are currently 100 bacteria colonies: How long will it take for the number of bacteria colonies to reach 6400? Greg is trying to save money for a down payment on a house. He Invests $15,000 in an account earning 5% annual Interest rate. How long will It take for the amount of money in the account to reach $19, 6177?

Solution

2) Depreciation = 6%

So,

25000 (1-0.06)^t = 13465

(0.94)^t = 0.5386

t = 10 years

5) 15000 (1+0.05)^t = 19617

t = 5.5 years