/**
* Returns the product of this number and the given one.
*
* The result has a scale of `$this->scale + $that->scale`.
*
* @param \Arki\Math\Number|int|float|string $that The multiplier. Must be convertible to a BigDecimal.
*
* @return BigDecimal The result.
*
* @throws \ArithmeticError If the multiplier is not a valid number, or is not convertible to a BigDecimal.
*/
public function multipliedBy($that)
{
$that = self::of($that);
if ($that->intVal->isEqualTo('1') && $that->scale === 0) {
return $this;
}
$value = $this->intVal->multipliedBy($that->intVal);
$scale = $this->scale + $that->scale;
return new self($value, $scale);
}
