letter$\_$grade$()$

This function determines a letter grade $("$A$","$B$",$ and so on$)$ based on a float argument representing a percentage grade.

It returns a letter grade based on the following rules:

Greater or equal to $90,$ return $"$A$"$

Greater or equal to $80,$ return $"$B$"$

Greater or equal to $70,$ return $"C"$

Greater or equal to $60,$ return $"$D$"$

Anything less, than $60$ return $"$E$"$ but greater or equal to $0$

If argument is negative or greater than $100,$ return $"x"$

pass$\_$or$\_$fail

This function determines if a student passed or failed a class, based on their final letter grade. Letter grades equal to $"A","B",$

$"$C$",$ or $"$D$"$ are passing grades $("$Pass$").$

Calculate percentage $-$ point$\_$grade function

This function calculates a percentage grade based on a score and total$\_$points. It calculates the percentage grade by

dividing score by total$\_$points, and multiplies result by $100.$ It returns the calculated percentage as a float rounded at two

decimals

Calculate final grade $-$ get$\_$grade$\_$results function

This function takes two score and total$\_$points, and it calls the previous functions you've written $-$ DO NOT recalculate

percentage of grade, letter grade, etc. in this function. You are required to call the other functions. It returns a message similar

to: Your grade is $92\mathrm{.}34($A $-$ Pass$)$ or Your grade is $35\mathrm{.}78($E $-$ Fail$)$

Test Cases

def main$()$:

# test letter$\_$grade function

assert letter$\_$grade $(90)=="$A$"$

assert letter$\_$grade$(80)=="$B$"$

assert letter$\_$grade$(70)=="$C$"$

assert letter$\_$grade $(60)=="$D$"$

assert letter$\_$grade$(59)=="$E$"$

assert letter$\_$grade $(-59)=="x$

assert letter$\_$grade$(110)=="$X$"$

# test pass$\_$or$\_$fail function

assert pass$\_$or$\_$fail$("$B$")==$ "Pass"

assert pass$\_$or$\_$fail$("$E$")==$ "Fail"

assert pass$\_$or$\_$fail$("$ABCD$")==$ "Error"

# test point$\_$grade function

assert point$\_$grade $(0,100)==0\mathrm{.}0$

assert point$\_$grade $(100,100)==100\mathrm{.}0$

assert point$\_$grade $(45,80)==56\mathrm{.}25$

assert point$\_$grade $(37,40)==92\mathrm{.}5$

# test get$\_$grade$\_$results function

assert get$\_$grade$\_$results $(0,100)==$ "Your grade is $0\mathrm{.}0($E $-$ Fail$)"$

assert get$\_$grade$\_$results $(45,80)==$ "Your grade is $56\mathrm{.}25($E $-$ Fail$)"$

assert get$\_$grade$\_$results $(37,40)==$ "Your grade is $92\mathrm{.}5($A $-$ Pass$)"$

main$()$