title: Running Total Issue
body: <p>I am very new to C++ and am trying to accomplish a program that will display the following: 
  1. A Total of all customer bills
  2. Total tax collected
  3. A customer count
  4. An average customer bill.</p>
  
  <p>The average bill, total tax, &amp; customer count all seem to be working just fine. It's the totalBill variable that is throwing it off I believe. I'll attach the code below, I can't figure it out! </p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;iomanip&gt;
  using namespace std;
  
  int main () {
  
  double mealPrice;
  double mealTotal;
  double totalBills;
  double totalTax;
  double mealTax;
  double averageBill;
  
  int customerCount = 0;
  mealTotal = 0.0;
  
  bool anotherMeal = true;
  char response;
  
  while (anotherMeal == true) 
  {
  cout &lt;&lt; "Enter price of your meal: ";
  cin &gt;&gt; mealPrice;
  cout &lt;&lt; endl;
  customerCount++;
  
  cout &lt;&lt; "Another cusotmer? y/n : ";
  cin &gt;&gt; response;        
  cout &lt;&lt; endl &lt;&lt; endl;
  if (response == 'n') anotherMeal = false;
  } //End While Loop
  
  mealTax = (mealPrice * 0.0575);
  mealTotal = (mealPrice + mealTax);
  totalBills = (mealTotal += mealTotal);
  totalTax = (mealTax + mealTax);
  averageBill = (totalBills / customerCount);
  
  cout &lt;&lt; fixed &lt;&lt; setprecision(2) &lt;&lt; right;
  cout &lt;&lt; "Total Customer Bills :  $ " &lt;&lt; setw(8) &lt;&lt; right &lt;&lt; totalBills &lt;&lt; endl;
  cout &lt;&lt; "Total Tax Collected :   $ " &lt;&lt; setw(8) &lt;&lt; right &lt;&lt; totalTax &lt;&lt; endl;
  cout &lt;&lt; "Customer Count : " &lt;&lt; setw(16) &lt;&lt; right &lt;&lt; customerCount &lt;&lt; endl;
  cout &lt;&lt; "Average Customer Bill : $ " &lt;&lt; setw(8) &lt;&lt; right &lt;&lt; averageBill &lt;&lt; endl;
  cout &lt;&lt; endl;
  cout &lt;&lt; endl;
  
  return 0;
  
  } //End Main
  </code></pre>
  
  <p>When complied it gives the right numbers only is there is one customer, if more the total will be thrown off. Thanks in advance!</p>