本题目来源于试卷: Sequences & Series，类别为 IB数学
[问答题]
The Australian Koala Foundx/q y1szie 6 z3w nje9i6k*6fxation estimates that there are8u8jj(+pwo 6nqr(de / jn)v qt 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 decren(qd u o(v)/+ejw8rjq jn68 ptase 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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