In an instant coffee plant, 10000 kg/hr of coffee extract containing 20% solids is concentrated using a vacuum evaporator which is designed to produce a concentrated extract with 50% solids suitable for freeze drying. However, it has been determined that a concentrate with 40% solids prior to the freeze-drying process results in better quality. If the operating condition within the evaporator remains the same (the evaporator continues to achieve a concentration change from 20% solids to 50% solids), determine the following parameters after the required change is made to meet the new requirements by a fraction of the feed bypassing the evaporator. 

A. the rate of production of the concentrated solution

B. the rate of evaporation of water

C. the fraction of the fresh feed needed to bypass the evaporator to achieve a product concentration of 40% solids.