An electronic sensor is listed for $622.87 less 31%, 20%, 6%. (a) What is the net price? (b) What is the total amount of discount allowed? (c) What is the exact single rate of discount that was allowed? (a) The net price is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (b) The total amount of discount allowed is $ (Round the final answer to the nearest cent as needed. Round all intermediate values to six decimal places as needed.) (c) The single rate of discount that was allowed is %. (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)