Between 2016 and 2021, the average retail price of organic coffee in the UK increased from £11.20 per kilo to £13.50 per kilo. Over the same period, the annual quantity of organic coffee purchased fell from 52 million kilos to 44 million kilos.
Calculate the change in total sales revenue for UK organic coffee retailers between 2016 and 2021. You are advised to show your working.
