India's Bajaj Auto Q4 net profit soars on one-time gain

* Q4 net profit 14 bln rupees vs 5.32 bln yr-ago * Q4 profit includes sales tax benefit of 8.27 bln rupees * Q4 net sales up 23 pct at 40.52 bln rupees * Input costs steadily rising - MD * Shares down 1...