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: : In a factory workers are put in two categories Grade A and Grade 'B'. For completing a particular jeb they were to be emplyed as Standard Time 50 Hours Composition of Work Grade A + 40 workers @ 24 per hour Grade B + 60 workers @ *2 per hour Actuals were Time Taken 50 Hours Composition of workers Grade A 45 workers @ 23 per hour Grade B 55 workers @ 2.50 per hour Compute the Labour Mix Variance