200 kg of solid on dry basis is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as Nc = 0.5 *10-3 kg/m2-s. The initial moisture content of the solid is 0.2 kg moisture/ kg dry solid. The interfacial area available for drying is 4 m2 /100 kg of dry solid. The moisture content at the end of drying period is.