For a particular product , the price - demand equation is p _ _ _ * + 1300 . where p is the price and I is the quantity , and the cost function is

For a particular product , the price - demand equation is p _ _ _ * + 1300 .where p is the price and I is the quantity , and the cost function isC" (` ) = 1000 + 3.2. What is the revenue function , r (` ) ?O r ( a ) =- - 2: 2 + 1820^0 r( a ) _ _^7' + 1820 PO r( a ) =`5- - 2 2 + 130 0^LiO r( x ) _ _- D - + 130 0POnone of these