Taxes calculating issues in cs-cart quantity discounted products

I am getting some issues in taxes,

When i am adding 1999pcs of products, due to quantity discounted
Price 0.37 x 1999 pcs = 739.63rs
GST Tax 18% = 139.93rs showing (Correct 18% is 133.13rs )

  1. Due to Google shopping policy, Price of products should show including taxes.
  2. If products are not showing including taxes google shopping will disapproved the products.
  3. The only way to show product price with taxes is when we select unit prices for taxes in cs-cart.

Please provide solution

  1. Products price will show with including taxes
  2. Taxes calculated on sub total.