maths plse help me..
posted by Anonymous .
shankar bought some grain for rs.9000 and spent rs.540 on transporting it. how much should he sell to make a profit of 20%

How much did he buy?

Do you mean how much should he sell IT FOR?
20% of 9000, PLUS transportation cost
= 1800 + 540 = 2340 rs 
ADDITION TO THE QUESTION
2340+9000
=$11340 He must sold the grain to make 20 % prophet. 
to make 20% over his total coast:
(9000 + 540 )1.20 = 1.2(9540) = 11448
That is 20% profit. A prophet is something else entirely. 
A coast is not a cost either :)