Problema Solution
Suppose that 20% of all aluminum cans are recycled each year. If 170,000 aluminum cans are released into the market, after how many years will 31,000 or fewer of these cans not yet be recycled?
Answer provided by our tutors
After n years there will be 170,000*0.80^n cans not yet recycled.
We need to find for what n we have:
170000*0.80^n <= 31000
........
........
n >= 7.63 years
After 8 years 31,000 or fewer cans will not be recycled.