Add 5 subjects marks of students and calculate percentage

//Add 5 subjects marks of students and calculate percentage.

#include<stdio.h>
#include<conio.h>
void main()
{
  float sub1,sub2,sub3,sub4,sub5,percentage;
  clrscr();
  printf("Enter the first subject marks:");
  scanf("%f",&sub1);
  printf("Enter the second subject marks:");
  scanf("%f",&sub2);
  printf("Enter the third subject marks:");
  scanf("%f",&sub3);
  printf("Enter the fourth subject marks:");
  scanf("%f",&sub4);
  printf("Enter the fifth subject marks:");
  scanf("%f",&sub5);
  percentage=((sub1+sub2+sub3+sub4+sub5)*100)/500.0;
  printf("percentage:%f",percentage);
 
getch();
}

Output:

Enter the first subject marks:56.0
Enter the second subject marks:58.5
Enter the third subject marks:85.5
Enter the fourth subject marks:75.0
Enter the fifth subject marks:65.0
percentage:68.000000