please find solution

In a drying operation, 50kg of a wet solid sample is to be dried. The wet solid contains 10wt% solid and 90wt% of water. After an hour of the drying operation, it was observed that the wet solid contains 80 wt % of water. Corresponding weight of the mixture after this 1 hour drying operation is: Select one a. 50Kg b. 10kg c. 35Kg d. 25Kg