There are 500 rooms in a multi-floored hotel. However, due to a change in rule, the hotel has to decrease the number of floors by 5. However, the management is able to put 5 more rooms in each floor. Over all, the number of rooms in the hotel decreases by 10%
If previously before modification the hotel has floors and 25 rooms in each floor now hotel has to increase the total no. of rooms to 600, then what is the additional number of rooms the hotel must put in each floor?

Options

A. A)20
B. B)15
C. C)10
D. D)25

Answer

C