The unnecessary information in the problem is the weight of the tires. Amount left = 72.
Work Step by Step
Total amount before spending = 250 No. of tires to be purchased = 4 Cost of each tire including tax = 42 + 2.50 = 44.50 So, to find out money left after buying four tires, we don't need the information about the weight of each tire. amount spent in buying 4 tires = 4 x 44.50 = 178 Amount left = 250 - 178 = 72