tcs Interview Numerical Ability Arithmetic

I lost my wallet and the money in that. But I remember that before I lost my wallet I purchased to things. First one I purchased by paying 10% of what in my wallet and also for second one i also pay 10% of what has been left in my wallet- that is equal to 9. then how much money I lost? A.81 b.25 c.63 d.54

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tcs Other Question

How many of number x ( x being integer) with 10<= x<= 99 are 18 more than the sum of their digits. . Hari has a piece of cake 60 cm long. He gives Raja half of it. He then gives Gopal 1/4th of what is left. After giving a piece to Sahi, be is left with 1/10th of the original. How much did he give to Sahil ? A.21.5 cm B.16.5 cm C.Rs. 5 D.Rs. 3