Ex4.1

#include <stdio.h>

#define A 15
#define B 12
#define C 9

int main () {
  int classA = 0, classB = 0, classC = 0;
  float income;
  printf("Please enter the number tickets sold in:\n");
  printf("Class A: ");
  scanf("%d", &classA);
  printf("Class B: ");
  scanf("%d", &classB);
  printf("Class C: ");
  scanf("%d", &classC);
  income = 0.95 * (classA*A + classB*B + classC*C);
  printf("Your income is %.2f\n", income);
  return 0;
}