a. Calculate the labour productivity, productivity growth and average growth of the two centers. (Do not leave any empty spaces; input a O wherever it is required. Do not round intermediate calculations. Round the final answers to 1 decimal place.) Cold Draw Dept Year Labour Output % 1 % 2 % 3 % Avg % Weld Mill Dept Year Labour Output % 1 2 3 Avg % b. Has workers' productivity in the two work centres increased? Yes