Unity Banking Procedure with I/O

BankingProcedure_Extra.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class BankingProcedure_Extra : MonoBehaviour {
    // setup global variables
    public double initialDeposit = 5000;
    public double rateBankA = .04;
    public double yearsBankA = 3;
    public double yearsBankB = 4;
    public double rateBankB = .03;

    // Use this for initialization
    void Start () {
        // setup start scope variables
        StringBuilder outputString = new StringBuilder();
        StreamWriter fileIO = new StreamWriter("Files/BankingOutput.txt");

        double finalValue1 = initialDeposit * Math.Pow((1 + rateBankA), yearsBankA);
        double differenceInValue;

        // setup string for Bank A
        string text = "BankA " + yearsBankA + "-year CD of $" + initialDeposit + " at " + rateBankA * 100 + "% rate is worth $" + Math.Round(finalValue1, 2);

        // output to console
        Debug.Log(text);

        // add to string builder and make sure new text goes to next line 
        // (Could also just add to the streamwriter here as another option)
        outputString.AppendLine(text);

        // demonstration of declaring a variable close to where it will be used
        double finalValue2 = initialDeposit * Math.Pow((1 + rateBankB), yearsBankB);

        // since text was stored in the stringbuilder this can be overwritten with new data here
        text = "BankB " + yearsBankB + "-year CD of $" + initialDeposit + " at " + rateBankB * 100 + "% rate is worth $" + Math.Round(finalValue2, 2);

        // add text to stringbuilder
        outputString.AppendLine(text);

        // output to console
        Debug.Log(text);

        //Find the difference
        differenceInValue = finalValue2 - finalValue1;


        if (differenceInValue > 0)
        {
            text = "Bank B's CD exceeds Bank A's CD by $" + Math.Round((differenceInValue), 2);
            outputString.Append(text);
            Debug.Log(text);
        }
        else if (differenceInValue < 0)
        {
            differenceInValue = finalValue1 - finalValue2;
            text = "Bank A's CD exceeds Bank B's CD by $" + Math.Round((differenceInValue), 2);
            outputString.Append(text);
            Debug.Log(text);
        }
        else
        {
            text = "There is no difference between Bank A's and Bank B's CD's";
            outputString.Append(text);
            Debug.Log(text);
        }

        // write the entire string from the stringbuilder to the streamwriter
        fileIO.Write(outputString);

        // close the streamwriter
        fileIO.Flush();



    }

    // Update is called once per frame
    void Update () {
		
	}
}