Aman gave 40% of the amount he had to Rohan. Rohan in turn gave one-fourth of what he received from Aman to Sahil. After paying Rs. 200 to the taxi driver out of the amount he got from rohan, Sahil now has Rs. 600 left with him. how much amount did Aman have? a.R`s .4000` b. `R s .8000` c. `R s .12 , 000` d. Data inadequate