Pasted

var $wrapper = $('#ecran-market-buy .listing-market-cards');
$wrapper.find('.wrapper-market-card').sort(function(a,b) {
    var v1 = ($(a).find('.score-card span').text()*1)/($(a).find('.cost:eq(0) span').text()*1);
    var v2 = ($(b).find('.score-card span').text()*1)/($(b).find('.cost:eq(0) span').text()*1);
    $(a).find('.pornstar-number').html('<span style="background:yellow;color:black;text-shadow:none;">&nbsp;<strong>'+(Math.round(v1*100)/100)+'</strong>&nbsp;pts/gem&nbsp;</span>');
    $(b).find('.pornstar-number').html('<span style="background:yellow;color:black;text-shadow:none;">&nbsp;<strong>'+(Math.round(v2*100)/100)+'</strong>&nbsp;pts/gem&nbsp;</span>');
    return v2-v1;
}).appendTo($wrapper);