$2\mathrm{.}1$ Write a php program that asks the user to enter five test scores.

The program should display a letter grade for each score and the average test score. Write the

following functions in the program:

$$ calc$\_$average. This function should accept five test scores as arguments and return the

average of the scores.

$$ determine$\_$grade. This function should accept a test score as an argument and return

a letter grade for the score based on the following grading scale:VVVVV$2\mathrm{.}1$ Write a php program that asks the user to enter five test scores.

The program should display a letter grade for each score and the average test score. Write the

following functions in the program:

calc$\_$average. This function should accept five test scores as arguments and return the

average of the scores.

determine$\_$grade. This function should accept a test score as an argument and return

a letter grade for the score based on the following grading scale:

$(15$ marks$)$