The following table shows the average monthly production of coal in tonnes for the year 2010-20 Year Production Year Production (in tonnes) (in tonnes) 2010 50.0 2015 38.1 2011 36.5 2016 32.6 2012 43.0 2017 41.7 2013 44.5 2018 41.1 2014 38.9 2019 33.8 (a) Compute the price indices from 2010 to 2019 by taking 2015 as the base year. (b) Compare the price of 2012 and 2015. (c) What is the percentage (%) change in the production from 2013 to 2019