self Maths Puzzle

On Jan 1st I put 1 rupee in bank on 2nd I put 2 on third I put 4 and it goes so on.By the end of the same month I would have come up to a particular amount.On which day I would have obtained the half of the amount ?

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self Other Question

what will be the next term in the following series?

a) 3 , 3, 4, 8, 10, 36, ?

b) 25, 26, 25, 26, 27, 28, ?

c) 18, 20, 22, 20, 28, 20, ?

d) 7, 6, 8, 5, 3, 7, ?

Please give the solution with explanation
how many 4 digit numbers of the form pqrs are there with p