A moneylender takes advantage of difficult situation of poor people and charges 50 interest However ...........

Explanation:

Let the moneylender has Rs 100 initially.
1st year ---> 100 + 50 (interest) ---> 150 – 20% bribe ---> 120
2nd year ---> 120 + 60 (interest) ---> 180 – 20% bribe ---> 144
3rd year ---> 144 + 72 (interest) ---> 216 – 20% bribe ---> 172.8
(This is the capital he will have at the beginning of 4th year)
So, if 172.8 --> 25,000
=> 36 (bribe given in 2nd year) = (25000/172.8) ∗ 36 which on simplifying becomes 25000/4.8.
Thus greater than 5000 but less than 6000.
So, he gave Rs.5200 as bribe at the end of the second year.