Code a FUNCTION that accepts three arguments and returns a percentage grade.
** The first two numeric arguments are the scores ( 1 and 2).
** The third numeric argument is the total number of points possible.
** The function calculates an average (points earned divided by points possible)
** Call the function from cell C13 and pass in the data from cells C9:C11 as arguments.
** Name the function Calc_Grade and place your name in the function comments
1st Score Earned	62.50
2nd Score Earned	75.60
Points Possible	200.00
Grade Average