SOLUTION: There are currently 80 million cars in a country, decreasing 3.4% annually. How many years will it take for this country to have 58 million cars? Round to 3 decimal places.

Question 1187748: There are currently 80 million cars in a country, decreasing 3.4% annually. How many years will it take for this country to have 58 million cars? Round to 3 decimal places.

Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

If the number of cars is decreasing by 3.4% per year, then the number of cars remaining is getting multiplied by 100%-3.4% = 96.6% each year. With a current count of 80 million, the number of millions of cars after n years will be

We want to know when the number of cars will be 58 million:

The quickest way to get an answer is by graphing on a graphing calculator. However, since the topic you chose is logarithms, we should get the answer that way.

We still need to get the answer using a calculator; but we did use logarithms to solve the problem.

I leave it to you to do the calculation and round the answer as directed.

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