Need help with finding savings in different plans.

AFCBrandon (2)
My assignment is to compare 3 different voice plans and ask a customer which plan they would like to choose along with how many minutes they use.

Plan A: 450 minutes for $39.99 (.45/minute for each additional minute used.)
Plan B: 900 minutes for $59.99 (.40/minute for each additional minute used.)
Plan C: Unlimited minutes for $69.99.

After finding the values, I must then display a message telling the customer how much they would save with a different plan.

EX: Customer chooses Plan A but uses 501 minutes. The total would come out to $62.94.

I would then have to display that the customer would save $2.95 if they switched to plan B from plan A. I've already done the rest but can't seem to manage to find a way to have the savings displayed correctly. 

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  #include <iostream>
using namespace std;
int main() {
    // variables
    double package_a_price = 39.99;
    double package_a_price1;
    double package_b_price = 59.99;
    double package_b_price1;
    double package_c_price = 69.99;

    double package_a_minutes = 450;
    double package_b_minutes = 900;

    double package_a_additional_charges = .45;
    double package_b_additional_charges = .40;

    char plan_choice;

    // Display
    cout << "The mobile phone service provider offers the following voice plans:\n" << endl;
    cout << "Package A: 450 minutes for 39.99. (.45/minute for each additional minute.)" << endl;
    cout << "Package B: 900 minutes for 59.99. (.40/minute for each additional minute.)" << endl;
    cout << "Package C: Unlimited Minutes for 69.99.\n" << endl;
    cout << "Enter which voice plan the customer subscribes to: " << endl;
    cin >> plan_choice;
    cout << endl;

    // Calculate User's Plan
    switch (plan_choice)
    {
        int mins_used;
        float total_charges;

        case 'a':
        case 'A':
        case 'b':
        case 'B':
        case 'c':
        case 'C':
            cout << "Enter the total number of minutes used during the month: " ;
            cin >> mins_used ;
            cout << endl;

            if (mins_used < 0 || mins_used > 44640)
            {
                cout << "That is not a valid amount for the minutes." << endl;
            }
            else
            {
                cout << "The amount due for the month is $" ;
                if (plan_choice == 'a' || plan_choice == 'A')
                {
                    total_charges = mins_used > package_a_minutes
                            ? package_a_price + ((mins_used - package_a_minutes) * package_a_additional_charges)
                            : package_a_price;
                }
                else if (plan_choice == 'b' || plan_choice == 'B')
                {
                    total_charges = mins_used > package_b_minutes
                            ? package_b_price + ((mins_used - package_b_minutes) * package_b_additional_charges)
                            : package_b_price;
                }
                else if (plan_choice == 'c' || plan_choice == 'C')
                {
                    total_charges = package_c_price;
                }
                cout << total_charges << endl;
            }
            break;

        default:
            cout << "The voice plan entered is invalid." << endl;
            break;
    }
    
    return 0;
};
ne555 (10692)
1
2
 
if total_charges_plan_a < total_charges_plan_b:
   print("you'll save ", total_charges_plan_b - total_charges_plan_a, " for being on plan A"
AFCBrandon (2)
Thank you!
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