I keep getting "Nothing to be done for Grade.cpp" I Dont Know Why!!!! aghhh here's code

#include <stdio.h>

int main ()

{

float PA, FP, MT, QZ, FE; Grade

if (Grade >= 90)
{
   printf("A! Great Job Tiger!\n");
   else if (Grade >= 80)
   printf("B!, Pretty Darn Tooten!\n");
   else if (Grade >= 70)
   printf("C, Ummm, too much Call of Dutes buddy\n");
   else
   printf("F, There's always welfare\n");

printf("Hello Scholar, input your estimated grades for each category\n");
printf("Project Assignments\n");
scanf("%f\n", PA);
printf("Final Project\n");
scanf("%f\n", &FP);
printf("MidTerms\n");
scanf("%f\n", &MT);
printf("Quizzes\n");
scanf("%f\n", &QZ);
printf("Final Exam\n");
scanf("%f\n", &FE);

Grade = ((PA*.4)+(FP*.1)+(MT*.2)+(QZ*.1)+(FE*.2))

return 0

}