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Q 2212880739.     A milkman sells `120` L of milk for `rs 3360` and he sells `240` L of
milk for `rs 6120`. How much concession does the trader give
per litre of milk, when he sells `240` L of milk?
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)