R squared after scaling every coordinate by two

A simple linear regression on some data gives $R^2=0.48$. You multiply both coordinates of every data point by $2$ (so $(2,5)$ becomes $(4,10)$) and refit. What is the new $R^2$? Enter $-1$ if it cannot be determined.

$0.48$. Scaling $y$ by $2$ multiplies both the residual and total sums of squares by $4$, and scaling $x$ just rescales the slope, so the ratio defining $R^2$ is unchanged.