### Line 15
  def total
    pennies + nickels + dimes + quarters + ones + fives + tens + twenties + fifties + hundreds
  end

### Line 19
  def discrepancy?
    total != amount.abs
  end

### Line 32
  protected
  def must_not_have_discrepancy
    errors.add("amount", "does not match totals given.") if discrepancy?
  end