The following function calculates percentage grade from points earned and total points possible. What's the minimum number of arguments $($inputs$)$ we must provide to run the calc$\_$grade$()$ function?

calc$\_$grade $=$ function$($earned$\_$points, total$\_$points $=50)\{$

percentage$\_$grade $=($earned$\_$points$/$total$\_$points$)*100$

return$($percentage$\_$grade$)$

$\}$