javascript - Perform an arithmetic calculation in jquery -

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i have looped through database table , displayed records in page. in every single record displayed there 3 essential elements - span class called "cost-per", 2nd span class called "quantity" , 3rd 1 called "total-cost". there 2 submit buttons use ajax increase , decrease quantity in database. here's problem. when press increase/decrease button, works , value in span class of "quantity" updated new database value. when ajax gives me new "quantity" result database, not want display it. want multiply value in "cost-per" span element , display result in "total-cost" span element. can me this? possible perform arithmetic calculations in jquery? thank in advance , sorry being wordy.

here php display records:

if(mysqli_num_rows($run) >= 1){                     while($row = mysqli_fetch_assoc($run)) {                         $name = $row['name'];                         $quantity = $row['quantity'];                         $price = $row['price'];                         $image = $row['image'];                         $category = $row['category'];                         $total = $price * $quantity;                         echo "<div class=\"post-container\">\n";                         echo "<div class=\"post-thumb\">\n";                         echo "<img src='$image'>\n";                         echo "</div>\n";                         echo "<div class=\"post-title\">\n";                         echo "<h4 style=\"font-weight:bold;\">\n";                         echo "<a href=\"view.php?name=$name&category=$category\" class=\"links\" target=\"_blank\">$name</a>\n";                         echo "<button type=\"submit\" id=\"deletion\" class=\"btn btn-default deletion\">delete</button>\n";                         echo "</h4>\n";                         echo "</div>\n";                         echo "<div class=\"post-content\">\n";                         echo "<ul style=\"list-style-type:none;\">\n";                         echo "<li>cost per item: <span id=\"cost\" class=\"cost-per\">$price</span>/=</li>\n";                         echo "<li>\n";                         echo "quantity: \n";                         echo "<button type=\"submit\" class=\"glyphicon glyphicon-minus decrease\" title=\"decrease quantity\"></button>\n";                         echo "\n";                         echo "<span id=\"cost\" class=\"quantity\">$quantity</span>\n";                         echo "\n";                         echo "<button type=\"submit\" class=\"glyphicon glyphicon-plus increase\" title=\"increase quantity\"></button>\n";                         echo "</li>\n";                         echo "<li>total cost: <span id=\"cost\" class=\"total-cost\">$total</span>/=</li>\n";                         echo "</ul>\n";                         echo "</div>\n";                         echo "</div>";                     }                 }

here jquery of 1 of buttons 

 $(".decrease").click(function(){         var __temp = $(this);         var itemname = __temp.parent("li").parent("ul").parent("div.post-content").siblings("div.post-title").find("a").text();         var cost = +(__temp.parent("li").parent("ul").find(".cost-per").text());         var total = __temp.parent("li").parent("ul").find(".total-cost").text();         $.post(             "decrease-cart.php?username=<?php echo $username?>",             {name: itemname},             function(result){                 __temp.siblings(".quantity").text(result);                 total = result * cost;             }         );     });

you need parse values floats if in decimal:

 $(".decrease").click(function(){         var __temp = $(this);         var itemname = __temp.parent("li").parent("ul").parent("div.post-content").siblings("div.post-title").find("a").text();         var cost = +(__temp.parent("li").parent("ul").find(".cost-per").text());         var total = __temp.parent("li").parent("ul").find(".total-cost").text();         $.post(             "decrease-cart.php?username=<?php echo $username?>",             {name: itemname},             function(result){                 __temp.siblings(".quantity").text(result);                 total = parsefloat(result) * parsefloat(cost);  // edited line =========             }         );     });

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