A scatter plot of $N=200$ points shows a relationship between variables $X$ and $Y$. The regression line is $\hat{y} = 2.5x + 10$. If the sum of squares of residuals is $SSE = 1200$ and the total sum of squares is $SST = 4000$, what is the coefficient of determination $R^2$ and the Pearson correlation coefficient $r$ (assuming positive correlation)?