A company sells four different types of products: P, Q, R, and S. The cost price of product P is Rs. 5,000, that of product Q is Rs. 7,000, that of product R is Rs. 10,000, and that of product S is Rs. 12,000. The company sold 200 units of product P at a 15% profit, 150 units of product Q at a 10% loss, 120 units of product R at a 20% profit, and 80 units of product S at a 5% loss. Calculate the average profit earned per unit by the company by selling all four types of products.

Calculate the total profit for each product by multiplying the units sold by the cost price and profit or loss percentage: P gives 200 x 5000 x 0.15 = 150000, Q gives 150 x 7000 x -0.10 = -105000, R gives 120 x 10000 x 0.20 = 240000, and S gives 80 x 12000 x -0.05 = -48000. Adding these together yields an overall profit of 150000 - 105000 + 240000 - 48000 = 237000. Divide this total profit by the sum of all units sold (200 + 150 + 120 + 80 = 550) to find the average profit per unit: 237000 / 550 is approximately Rs. 431.

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