Calculate the gross margin ratio for each of the following separate cases A through D: 
Definitions:
Acid Tanker
A specialized tank truck designed for transporting acidic substances safely, featuring materials and construction that resist corrosion and damage from acids.
Stainless Steel
A corrosion-resistant alloy steel containing chromium, used in a wide variety of applications for its durability and appearance.
Non-Reactive
Describes substances that do not easily undergo chemical reactions with other substances under given conditions, often related to material safety and stability.
Silicone RTV
A room-temperature-vulcanizing silicone used as a sealant or adhesive, capable of forming durable, flexible seals resistant to temperature and moisture.
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