An army’s recruitment process included N rounds of selection tasks. For the first A rounds, the rejection percentage was 60 percent per round. For the next B rounds, the rejection percentage was 50 percent per round and for the remaining rounds, the selection percentage was 70 percent per round. If there were 20000 people who applied for the army and 196 were finally selected, what was the value of N?	Choices.
A) 4
B) 5
C) 6
D) 8
E) 10
step(1) 8000 accepted.   step(2) another 40%of 8000=3200 accepted.   here it is quiet observable that if we further deduct candidate by 60% it would change our probablity of easy going 2000 candidate.   so i would get to second stage of recruitment where 50 % is accepted   step(3) 50% of 3200=1600   step(4) 50% of 1600=800   step(5) 50% of 800=400   Step(6) 50% of 400=200   70% of 400=280   and last step of accepting 70% of 280=196(our target)   total 8 steps required.   Ans 8
<result>D</result>
An army’s recruitment process included N rounds of selection tasks. For the first A rounds, the rejection percentage was 60 percent per round. For the next B rounds, the rejection percentage was 50 percent per round and for the remaining rounds, the selection percentage was 70 percent per round. If there were 20000 people who applied for the army and 196 were finally selected, what was the value of N?