Coefficient of Determination

You have been asked to solve for the Coefficient of Determination (R2). The Sum of Squared Regression (SSR) is .020 and Sum of Squared Total (SST) is .025, what is the Coefficient of Determination (R2) and what does that mean?The R2 is 0.20 and 20% of the variation is cost can be explained by the data. The R2 is 0.80  and 80% of the variation in cost can be explained by the data.The R2 is 0.20 and 80% of the variation in cost can be explained by the data. The R2 is 0.80  and 20% of the variation in cost can be explained by the data.