CSC Company Logical Reasoning Number Series

Find the next number in the series-4 problems they were so easy like:
2,4,6,8,?
Increase by 2,4,16,25 etc.

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CSC Other Question

if f(x,0)=x+1
f(o,y)=y
f(x,y)=f(f(x,0),f(2*x-1))

then find f(1,1),f(2,3),f(3,0) Alfred buys an old scooter for Rs. 4700 and spends Rs. 800 on its repairs. If he sells the scooter for Rs. 5800, his gain percent is:
A.
32/7%

B.
60/11%

C.
10%

D.
12%