private function _getTotalExpense($currentDate)
{
$itemExpenseService = new ItemExpenseService();
$totalItemExpense = $itemExpenseService->getTotalExpense($currentDate);
$otherExpenseService = new OtherExpenseService();
$totalOtherExpense = $otherExpenseService->getTotalExpense($currentDate);
return $totalItemExpense + $totalOtherExpense;
}
