During a survey, the set up of the instrument has been observed not in the middle of two stations. So it is found out that the BS and FS readings for Sta 00+100, Sta 00+150, and Sta 00+225 were erroneous. The correct elevation (with the reference at sea level) for Sta +100, Sta +150, and Sta +225 are 876.4830m, 881.7542m, and 879.9544m respectively. The tabulation of incorrect BS and FS were given below. Station BS FS 00+100 4.3512 00+150 1.5496 0.7783 00+225 2.4545 3.1010 Determine the correct BS reading for Sta 00+150 if the instrument is located 35m away from Sta 00+150 and 40m away from Sta 00+225.