Following observations were taken using a Tacheometer with staff held vertical. The additive and multiplying constants of the instrument are 0 and 100, respectively. The reduced level (RL) of the staff station R, in \(m\), is
. (rounded off to two decimal places)
| Instrument station | Staff station | Staff reading (m) | Vertical angle | Remarks |
|---|
| P | Q | 1.4, 2.7, 3.9 | 7° | RL of Q = 102 m |
| P | R | 2.1, 2.8, 3.6 | 5° | |