My Answer

#include
#include

int comparison(int);
int main()
{
int userInputOfUnit;
printf(“Enter The Units: “);
scanf(“%d”, &userInputOfUnit);
float ADDITIONAL = (float) 15/100;
float unitsValue;
float unitPayment;
int res = comparison(userInputOfUnit);

switch (res)
{
case (0):
perror(“innorrect units”);
break;
case(1):
unitsValue = userInputOfUnit * 20;
unitPayment = unitsValue * ADDITIONAL;
printf(“_______________________________________\n\n”);
printf(“\tUnits: %d\n”, userInputOfUnit);
printf(“\tUnits Payment: %.2f\n”, unitsValue);
printf(“\tTotal Payment: %.2f\n”, unitPayment);
printf(“_______________________________________\n”);
break;
case (2):
unitsValue = userInputOfUnit * 35;
unitPayment = unitsValue * ADDITIONAL;
printf(“_______________________________________\n\n”);
printf(“\tUnits: %d\n”, userInputOfUnit);
printf(“\tUnits Payment: %.2f\n”, unitsValue);
printf(“\tTotal Payment: %.2f\n”, unitPayment);
printf(“_______________________________________\n”);
break;
case (3):
unitsValue = userInputOfUnit * 45;
unitPayment = unitsValue * ADDITIONAL;
printf(“_______________________________________\n\n”);
printf(“\tUnits: %d\n”, userInputOfUnit);
printf(“\tUnits Payment: %.2f\n”, unitsValue);
printf(“\tTotal Payment: %.2f\n”, unitPayment);
printf(“_______________________________________\n”);
break;
case (4):
unitsValue = userInputOfUnit * 60;
unitPayment = unitsValue * ADDITIONAL;
printf(“_______________________________________\n\n”);
printf(“\tUnits: %d\n”, userInputOfUnit);
printf(“\tUnits Payment: %.2f\n”, unitsValue);
printf(“\tTotal Payment: %.2f\n”, unitPayment);
printf(“_______________________________________\n”);
break;
default:
perror(“innorrect units”);
}
return 0;
}

int comparison(int value)
{
if (1 <= value && value <= 50)
return 1;
else if (51 <= value && value <= 150)
return 2;
else if (151 <= value && value <= 250)
return 3;
else if (250 <= value)
return 4;
else
return -1;
}