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/**
 * 计算百分比
 * @param $molecule     分子
 * @param $denominator  分母
 * @param int $precision 保留的小数点位数
 * @return \Illuminate\Http\JsonResponse
 */
function percentage($molecule, $denominator, $precision = 2) {
    if(empty($molecule) || empty($denominator)) {
        return '0.00%';
    }
    return sprintf('%.2f',($molecule/$denominator)*100).'%';
}