In South Australia (SA), the median hourly earnings for male em- ployees rose from $32.23 in 2019 to $33.22 in 2020 to $35.00 in 2021. In comparison, the median hourly earnings for female employees rose from $30.00 in 2019 to $32.56 in 2020 to $33.33 in 2021. ¹ (a) What was the average rate of change in the median hourly earn- ings for male employees between 2019 and 2020? (b) What was the average rate of change in the median hourly earn- ings for female employees between 2019 and 2020? (c) What was the average rate of change in the median hourly earn- ings for female employees between 2019 and 2021? (d) Based on this data, why can we say that in SA, the median hourly earnings for female employees is not increasing linearly?

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