need c and d answers pls

Problem 6-15 (Static) An assembly line is to operate eight hours per day with a desired output of 240 units per day. The following table contains information on this product's task times and precedence relationships TASK TIME IMMEDIATE (SECONDS) PREDECESSOR TASK A COWO D E 60 Be 20 50 90 30 30 60 B, C C D E, F G H c. Balonce this line using the longest task time (Leave no cells blank.be certain to enter "o" wherever required.) Work Station Task 1 11 TA B-C D-E-F IGH Idle Time (in seconds) 10 0 20 20 IV d. What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b? (Round your answer to 1 decimal place.) Efficiency %