Refer to the Diagram; The benchmark is at an elevation of 147.6. The height of the instrument is 3.75 and a foresite to the grade rod reads 3.94. What is the height at the point the leveling rod is placed?

Refer to the Diagram; The benchmark is at an elevation of 147.6. The height of the instrument is 3.75 and a foresite to the grade rod reads 3.94. What is the height at the point the leveling rod is placed?