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Mathematics, 02.10.2019 19:00 benchang531

The per-employee cost of insurance rose by 13% between 2015 and 2016. it then dropped by 2% between 2016 and 2017. it then increased by 17% between 2017 and 2018. by what percentage did the cost of insurance change between 2015 and 2018? (note: the answer is not 28%! )

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