In the country of Karamania, the CPI is calculated using a market basket consisting of 5 apples, 4 loaves of bread, 3 robes and 2 gallons of gasoline. The per-unit prices of these goods have been as follows: Year Apples Bread Robes Gasoline 2020 $1.00 $2.00 $10.00 $1.00 2021 $1.00 $1.50 $9.00 $1.50 2022 $2.00 $2.00 $11.00 $2.00 2023 $3.00 $3.00 $15.00 $2.50 Using 2020 as the base year, what was the inflation rate between 2020 and 2021?