need help putting into formula

Type your answer in the box. Suppose a firm produces two products, X and Y. The firm earns revenues from X equal to $50,000 and revenues from Y equal to $30,000, The own price elasticity of demand for X is -2 and the cross-price elasticity of demand between X and Y is -0.6. If the firm lowers the price of product X by 1%, the change in total revenues will be $ (Do not add any negative sign before your answer.) Do you know the answer? Read about this I know it Think so Unsure No idea 11 Items left