本题目来源于试卷: Sequences & Series，类别为 IB数学
[问答题]
The Australian Koala Foun5ocgbzq2,k z- dation est2inm83g f( km* +2nrjdj3eff limates that there are about 45000 koalas left in the wild in 2019 . A year before, in 2018 , the population of koalas was estimated as 50000 . Assuming the population of koalas continuem dj8r2ile g3m(k nj*f3ff2+n s to decrease by the same percentage each year, find:
1. the exact population of koalas in 2022 ;
2. the number of years it will take for the koala population to reduce to half of its number in 2018 .
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