Suppose the hourly wage rate is $29,the rental price of capital is $5and the price of output is constant at $47 per unit.Firm's production technology is q =4K^0.25E^0.75,the marginal product of employment is MP_E=3K^0.25E^-0.25and the marginal product of capital is MP_K =K^-0.75E^0.75.What is firm's optimal demand of labor if firm plans to produce q=10units of outputs in the long-run?(please keep 1 decimal place in your answer)