Problem 1 : New Wave Sale, Java

Problem 1 : New Wave Sale

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        System.out.println(phones(2));
        
    }
    
    public static double phones(int q)
    {
        if(q == 1)
        {
            double discount = 1299.5-(1299.5*0.05);
            return discount + (discount*0.06);
        }
        if(q == 2)
        {
            double discount = (2*1299.5)-((2*1299.5)*0.11);
            return discount + (discount*0.06);
        }
        if(q == 3)
        {
            double discount = (3*1299.5)-((3*1299.5)*0.20);
            return discount + (discount*0.06);
        }
        if(q == 4)
        {
            return discount = (4*1299.5)-((4*1299.5)*0.30);
            return discount + (discount*0.06);
        }
        if(q >= 5)
        {
            return discount = (q*1299.5)-((q*1299.5)*0.75);
            return discount + (discount*0.06);
        }
        return 1;
    }
}

[ + ] Show input
Compilation time: 0.63 sec, absolute service time: 0,74 sec

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Error(s), warning(s):

source_file.java:34: error: cannot find symbol
            return discount = (4*1299.5)-((4*1299.5)*0.30);
                   ^
  symbol:   variable discount
  location: class Rextester
source_file.java:35: error: cannot find symbol
            return discount + (discount*0.06);
                   ^
  symbol:   variable discount
  location: class Rextester
source_file.java:35: error: cannot find symbol
            return discount + (discount*0.06);
                               ^
  symbol:   variable discount
  location: class Rextester
source_file.java:39: error: cannot find symbol
            return discount = (q*1299.5)-((q*1299.5)*0.75);
                   ^
  symbol:   variable discount
  location: class Rextester
source_file.java:40: error: cannot find symbol
            return discount + (discount*0.06);
                   ^
  symbol:   variable discount
  location: class Rextester
source_file.java:40: error: cannot find symbol
            return discount + (discount*0.06);
                               ^
  symbol:   variable discount
  location: class Rextester
6 errors

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