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Question 1 Table below shows the median gross monthly income from work (including employer CPF contributions) of full-time employed residents for 2011-2021. Median gross monthly income ($) 2011 3,249 2012 3,480 2013 3,705 2014 3,770 2015 3,949 2016 4,056 2017 4,232 2018 4,437 2019 4,563 2020 4,534 2021 4,680 a) Calculate the average annual change in median gross monthly income for the period 2011- 2016 and 2016 - 2021 respectively. b) Calculate the cumulative change in median gross monthly income for the period 2011 -2016 and 2016- 2021 respectively. . c) Discuss your observations on the income trends in the past decade, based on you answers in a and b, as well as some graphic representation. *