Others Maths Puzzle

If M person go to hotel and spend Rs.D in equal amount. If 3 person dont have money ,then remaining person contripute that amount as quual sharing . How many rs. each person pay extra?

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Others Other Question

if any one knows any simple trick to solve this question ..plz tell me.solve it without using calci...
(27/9)^2*((399/39) /(41/899))
there is a lamp in a room and 3 switches are there out side room of which one is connected to the lamp. a person is allowed to get into the room only once and he can use the every switches for once to on once to off the switch. how to identify which switch is connected to the lamp in the room