Task: Question Answering
Input (English): Problem: 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 10000 people who applied for the army and 350 were finally selected, what was the value of n ?
Options: a. 4, b. 5, c. 6, d. 9, e. 8
Output (English): d