Fish are processed into fish meal and used as a supplementary protein food. In the processing, the oil is first extracted to produce a wet fish cake containing 80 wt % water and 20 wt % bone-dry cake. This wet cake feed is dried in rotary-drum dryers to give a “dry” fish cake product containing 40 wt % water. Finally, the product is finely ground and packed. Calculate the kg/h of wet cake feed needed to produce 1000 kg/h of “dry” fish cake product.