5:5 Calculate the simple and the weighted arithmetic average price per ton of coal purchased by an industry for the half year. Account for the difference between the two. Month Price per ton Tons purchased Jan. Rs. 42.50 25 Feb. Rs. 51.25 30 Mar. Rs. 50.00 40 Apr. Rs. 52.00 SO May Rs. 44 25 10 June Rs. 54.00 45