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abstract class LoadAccount
{
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protected $interest, $fund;
public function calculateInterest() {
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$this->interest = getInterestRate();
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$this->interest = $this->getFund() * $this->getInterstRate();
return $this->interest;
}
private function getFund() {
return $this->fund;
}
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protected abstract function getInterstRate();
}
?>
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