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<?php
 
class BussinessAccount extends Account {
  
}
 
$businessAcc = new BussinessAccount(400);
print_r($businessAcc->getBalance());
 
 
 
class SavingAccount extends Account {
  private $interestRate;
  
  public function __construct($balance, $interestrate) {
    parent::__construct($balance);
    $this->interestRate = $interestRate;
  }
}

$savingAcc = new SavingAccount(400, 0.05);
print_r($savingAcc);
?>