How to calculate the manual excavation cost of the foundation?

In this video, the manual excavation cost of the footing pit is explained in two different methods. The detailed explanation of manual excavation & JCB excavation URL is as follows. https://www.paramvisions.com/2021/03/manual-excavation-analysis-for-building.html https://www.paramvisions.com/2021/03/rate-analysis-of-jcb-excavation-for.html For a comparison of JCB & manual excavation URL, https://www.paramvisions.com/2021/03/comparing-jcb-manual-excavation-cost.html