library ExtraMath {
    /**
     * @dev Calculates the percentage of a number
     * @param number: The number to calculate the percentage of
     * @param percentage: The percentage of the number to return
     * @return The percentage of a number
     */
    function percentageOf(uint256 number, uint256 percentage)
        internal
        pure
        returns (uint256)
    {
        return (number * percentage) / 100;
    }
}
function percentageOf(uint256 number, uint256 percentage)
    internal
    pure
    returns (uint256)
{
    return (number * percentage) / 100;
}

/**
 * @dev Calculates the percentage of a number
 * @param number: The number to calculate the percentage of
 * @param percentage: The percentage of the number to return
 * @return The percentage of a number
 */