Why is there 2 "0"s on my output in "Tuition Fee Discount"?

Question

int main()
{
    float Grades;
    char Average;
    int Tuition;
    
//Formula for the Grades
    Grades = ( 90.00 + 87.00 + 99.00 + 75.00 + 77.00 + 80.00 + 100.00 + 94.00 + 83.00 ) / 9;
    
    
//Output    
    printf("Intro to Computing                :     90\n");
    printf("Fundamentals of Programming       :     87\n");
    printf("Business Application Software     :     99\n");
    printf("Understanding the Self            :     75\n");
    printf("Purposive Communication           :     77\n");
    printf("Mathematics in the Modern World   :     80\n");
    printf("Physical Fitness and Wellness     :     100\n");
    printf("Reading in the Philippine History :     94\n");
    printf("NSTP1                             :     83\n");
    printf("---------------------------------------------\n");
    printf("General Weighted Average          :     %.2f\n", Grades);
    
//Scholarship Grant       
    printf("Scholarship Grant                 :     %c", Average);
    if (Grades <= 100 && Grades >= 98) {
        printf("President's List");
    }
    else if (Grades <= 97 && Grades >= 95) {
        printf("College Scholar");
    }
    else if (Grades <= 94 && Grades >= 92) {
        printf("Dean's List");
    }
    else {
        printf("None");
    }
    
//Tuition Fee Discount  
    printf("\nTuition Fee Discount              :     %d", Tuition);
    if (Grades <= 100 && Grades >= 98) {
        printf("100%%");
    }
    else if (Grades <= 97 && Grades >= 95) {
        printf("50%%");
    }
    else if (Grades <= 94 && Grades >= 92) {
        printf("30%%");
    }
    else {
        printf("0%%");
    }
    return 0;
}

Answer 1

To have 0% printed on the output, your code must have ended up here:

    else {
        printf("0%%");
    }

You can easily verify this by printing out the value of Grades:

printf("Grades: %f\n", Grades);

You can see the value of Grades is 87.222221, hence your code does what it does.

Also, I think your code doesn't really work the way you'd like it to.

    if (Grades <= 100 && Grades >= 98) {
        printf("100%%");
    }
    else if (Grades <= 97 && Grades >= 95) {
        printf("50%%");
    }
    else if (Grades <= 94 && Grades >= 92) {
        printf("30%%");
    }
    else {
        printf("0%%");
    }

What happens for instance if Grades = 97.7?  Well, it ends up printing 0.

I have a feeling what you really want would be better described by this piece of code:

    float discount = 0.0f;
    if (Grades <= 100.0f)
    {
        if (Grades >= 98.0f)
            discount = 100.0f;
        else if (Grades >= 95.0f)
            discount = 50.0f;
        else if (Grades >= 92.0f)
            discount = 30.0f;
    }
    printf("%.2f%%", discount);