The grade for a footing is set using a builders level. The bottom of the footing will be at elevation 94.00`. The backsight to the benchmark (elevation 100.00`) has a rod reading of 4.70`. What should t he rod reading be for the bottom of the footing if the grade is correct?

The grade for a footing is set using a builders level. The bottom of the footing will be at elevation 94.00`. The backsight to the benchmark (elevation 100.00`) has a rod reading of 4.70`. What should t he rod reading be for the bottom of the footing if the grade is correct?