The demand functions for two products are given below, p_1, p_2, q_1, and q_2 are the prices (in dollars) and quantities for products 1 and 2. q_1 =350 + p_1 +2p_2 q_2 = 225 + p_1 + p_2 Are these two products complementary goods or substitute goods? What is the quantity demanded for each when the price for product 1 is $20 per item and the price for product 2 is $30 per item? Write a function R(p_1, p_2)that expresses the total revenue from these two products. Find the price and quantity for each product that maximizes the total revenue