Profits increased by 20% from 2021 to 2022, which means that the new profit is 120% of the old profit. Then, profits decreased by 10% from 2022 to 2023, which means that the new profit is 90% of the old profit. Therefore, the overall percentage change in profits from 2021 to 2023 is: (120%)(90%) = 108%-100%=8%