Luigi's Restaurant offers a "buy one dinner get the other dinner for half price" sale. The "half price" refers to the lower-priced dinner. A customer orders a steak dinner with a regular price of $20.00, and a pasta dinner with a regular price of $11.00. (a) What was the overall markdown value at which the dinners were sold? (b) What was the overall markdown rate at which the dinners were sold? (a) The markdown value is $. (Type an integer or a decimal.) (b) The markdown rate is %. (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)