Returns a {@code BigDecimal} whose value is <code>(this ×
multiplicand)</code>, and whose scale is {@code (this.scale() +
multiplicand.scale())}.
@param multiplicand value to be multiplied by this {@code BigDecimal}.
@return {@code this * multiplicand}
Returns a {@code BigDecimal} whose value is <code>(this × multiplicand)</code>, and whose scale is {@code (this.scale() + multiplicand.scale())}.
@param multiplicand value to be multiplied by this {@code BigDecimal}. @return {@code this * multiplicand}