A grocery store sells two kinds of citrus fruit: oranges and grapefruit. These arecompeting – when the price of one increases, it causes more of the other to be sold. LetQ(g, r) represent the quantity (in kilograms) of grapefruit sold withgbeing theprice of grapefruit ($/kg) andrbeing the price of oranges ($/kg).Interpret the equation∂Q∂r∣∣∣(3,4)=Qr(3,4) = 6.Use the contextual words or phrases "quantity of grapefruit sold", "dollars", "kilo-grams", etc... in your interpretation.