public function calculateTotalInterest(Loan $loan)
{
if ($loan->getInstallmentPeriod() == 0) {
$totalInterest = $loan->getNativeDisbursedAmount() * ($loan->getInterestRate() / 100) * ($loan->getInstallmentCount() / 12);
} else {
$totalInterest = $loan->getNativeDisbursedAmount() * ($loan->getInterestRate() / 100) * ($loan->getInstallmentCount() / 52);
}
//TODO. change nativeAmount to USD
return $totalInterest;
}