A prestige shoemaking factory's output of men's business shoes (q) depends on the number of hours of labour (L) that the factory uses and the number of square metres of leather hides used (H) according to the formula q=0.25L 1.5H0.25-80L 0.25H0.5 What is the marginal product of labour when 476 hours of labour and 160 sq. metres of leather hides are used? (Give your answer correct to four decimal places.)