Código PHP:
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class math { private $x; private $y; private $iva; public function __construct($iva) { $this->iva = $iva; } public function suma($valor1, $valor2) { $this->x = $valor1; $this->y = $valor2; $sumar = $this->x + $this->y; return $sumar; } public function resta($valor1, $valor2) { $this->x = $valor1; $this->y = $valor2; $restar = $this->x - $this->y; return $restar; } public function division($valor1, $valor2) { $this->x = $valor1; $this->y = $valor2; $dividir = $this->x / $this->y; return $dividir; } public function calculariva($valor) { $iva = ($valor * $this->iva) / 100; return $iva; } }