A small accounting class for demonstration

Accounting.php

<?php

namespace App\Services;

class Accounting
{
    /**
     * Calculate the margin
     *
     * @param     $buyAtFigure
     * @param     $sellAtFigure
     * @param int $round
     * @return float
     */
    public static function margin($buyAtFigure, $sellAtFigure, $round = 2)
    {
        return round((($sellAtFigure - $buyAtFigure) / $sellAtFigure) * 100, $round);
    }

    /**
     * Calculate the markup
     *
     * @param     $buyAtFigure
     * @param     $sellAtFigure
     * @param int $round
     * @return float
     */
    public static function markup($buyAtFigure, $sellAtFigure, $round = 2)
    {
        return round((($sellAtFigure - $buyAtFigure) / $buyAtFigure) * 100, $round);
    }
}