Between 2018 and 2023, the average wholesale price of premium ceremonial-grade matcha powder imported into Germany rose from €42.80 per kilogram to €51.50 per kilogram. During the same period, the annual volume of matcha powder purchased by distributors fell from 8.5 million kilograms to 7.2 million kilograms.
Calculate the change in total sales revenue for German matcha importers between 2018 and 2023. You are advised to show your working.
