Adding condition from a jradiobutton and one or more jcheckboxes

I am making a pizza order system in Java netbeans where the user has multiple toppings to choose from and displays the total amount in a message box. For example, the user choose small (pizza size), then selects 3 toppings the total will now be $5.5. If the user choose small (pizza size), then selects 7 toppings, the total will be $9.25 and vice versa. Any help will be appreciated.

Sample output below

My code for the confirm button

private void jButton_confirmOrderActionPerformed(java.awt.event.ActionEvent evt) {                                                     
        float pizzaS_amount = (float) 4.00;
        float toppings_amount = (float) 0.75;
        float total = 0;
        
        if (jRadioButton_pizzaS.isSelected()){
            total = pizzaS_amount;
            if (jCheckBox_pepperoni.isSelected()){
                total = pizzaS_amount + toppings_amount;
                if (jCheckBox_pepperoni.isSelected() && jCheckBox_extraCheese.isSelected()){
                    total += toppings_amount;
                }  
            }
        }
        
        jTextArea_confirmOrder.append("total: " + total);
        JOptionPane.showMessageDialog(null, jTextArea_confirmOrder, "CONFIRM ORDER", JOptionPane.INFORMATION_MESSAGE);
        jTextArea_confirmOrder.setText(null);
    }