A shopkeeper mixes three types of rice costing ₹50 per kg, ₹60 per kg and ₹75 per kg in the ratio of 3 : 1 : 2. The average cost of the mixture per kg is:

₹75 ₹65 ₹50 ₹60

₹60

Sum of cost of 3 types of rice = 50 × 3R + 60 ×1R + 75× 2R = 150R + 60R + 150R = 360R Average cost = \(\frac{360R}{6R}\) = 60