<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script>
var jQ = $.noConflict(true);

// version 3
jQ( document ).ready(function() {
jQ('input[name="total"]').prop('readonly', true);
var qty1 = 0;
var Item_1 = 0.00;
var qty2 = 0;
var Item_2 = 0.00;
// add more qty# and Item_# as you add more calculations



jQ('select[name^="Item"],input[name^="Item"]').on('change', function() {

// Start of Item_1 calculation
var filter_type1 = jQ('select[name="Item_1_filter_type"]').val();

if(filter_type1 == "Pleated Filter 12pk (1-Inch Thick) $79.95"){
price1 = 79.95;
qty1 = jQ('input[name="Item_1_1inch_qty"]').val();
}
else if(filter_type1 == "Pleated Filter 12pk (2-Inch Thick) $89.95"){
price1 = 89.95;
qty1 = jQ('input[name="Item_1_2inch_qty"]').val();

}
else if(filter_type1 == "Pleated Filter 4pk (4-Inch Thick) $99.95"){
price1 = 99.95;
qty1 = jQ('input[name="Item_1_4inch_qty"]').val();
}
else if(filter_type1 == "Pleated Custom Size 12pk (1-Inch Thick) $85.95"){
price1 = 85.95;
qty1 = jQ('input[name="Item_1_1inch_custom_qty"]').val();
}
else if(filter_type1 == "Pleated Custom Size 12pk (2-Inch Thick) $95.95"){
price1 = 95.95;
qty1 = jQ('input[name="Item_1_2inch_custom_qty"]').val();
}
else if(filter_type1 == "Pleated Custom Size 4pk (4-Inch Thick) $105.95"){
price1 = 105.95;
qty1 = jQ('input[name="Item_1_4_custom_inch_qty"]').val();
}

if(jQ.isNumeric(qty1) && filter_type1 != ""){
Item_1 = price1 * parseInt(qty1) ;
calculate_total(Item_1,Item_2);// add more Item_# as you add more calculations
}

// End of Item_ 1 calculation


// Start of Item_2 calculation

var filter_type2 = jQ('select[name="Item_2_filter_type"]').val();

if(filter_type2 == "Pleated Filter 12pk (1-Inch Thick) $79.95"){
price2 = 79.95;
qty2 = jQ('input[name="Item_2_1inch_qty"]').val();
}
else if(filter_type2 == "Pleated Filter 12pk (2-Inch Thick) $89.95"){
price2 = 89.95;
qty2 = jQ('input[name="Item_2_2inch_qty"]').val();
}
else if(filter_type2 == "Pleated Filter 4pk (4-Inch Thick) $99.95"){
price2 = 99.95;
qty2 = jQ('input[name="Item_2_4inch_qty"]').val();
}
else if(filter_type2 == "Pleated Custom Size 12pk (1-Inch Thick) $85.95"){
price2 = 85.95;
qty2 = jQ('input[name="Item_2_1inch_custom_qty"]').val();
}
else if(filter_type2 == "Pleated Custom Size 12pk (2-Inch Thick) $95.95"){
price2 = 95.95;
qty2 = jQ('input[name="Item_2_2inch_custom_qty"]').val();
}
else if(filter_type2 == "Pleated Custom Size 4pk (4-Inch Thick) $105.95"){
price2 = 105.95;
qty2 = jQ('input[name="Item_2_4_custom_inch_qty"]').val();
}

if(jQ.isNumeric(qty2) && filter_type2 != ""){
Item_2 = price2 * parseInt(qty2) ;
calculate_total(Item_1,Item_2);// add more Item_# as you add more calculations
}
// End of Item_ 2 calculation

// Add more calculations for each dropdown here adjust Item_#, price#, qty#, and addjust filter_type#




// Add calculations above here.
});

//This calculates the total after changes have been made. Add more Item_#'s for each caculation added above
function calculate_total(Item_1,Item_2){
var Total_Cost_Raw = Item_1 + Item_2;
var Total_Cost = Total_Cost_Raw.toFixed(2);
console.log(Total_Cost);
jQ('input[name="total"]').val(parseFloat(Total_Cost));
}
});
</script>