Assume that Dire Industrial PLC$.$ Company has planned to produce $300000$ units of Shirts for the next year. The company has $6$ hrs$.$ as standard working hours per unit that recognized by way of minimum contribution from each employee. The production hours per workman per year is expected to be $2500$ hours. At present, $400$ employees are on duty. From the information given, forecast the number of additional workforce required for the next year using the work$-$study techniques.