Need help with WooCommerce

I am trying to create a plugin for WooCommerce. I am trying to fetch a JSON from a URL and then show price what I fetched from the JSON on beside the WooCommerce Product Price. And I want to divide the Fetch Price with the current WooCommerce product price then show it on the product. But, the problem is when I am running the code it's all time showing me "Warning: Division by Zero". It may be because the WooCommerce price is a String. We will have to convert it to Integer but I don't know why. Or I might apply the filter to anything else. I am attaching the code on here. Please, review the code let me know who's able to help me for this issue