本题目来源于试卷: Sequences & Series，类别为 IB数学
[问答题]
The Australian Koala Foundatio2s ,tmzdhie2ku9q :o ,pdfo.(c:wt2w n estimates that there a4 1a-ps2fg(en x n)zacre 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 continues to decrease by the same percentage each year, fi-aeg1 xa)4 (nzfn2pscnd:
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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