Given:

Excavation Volume $=150$ cu$.$m$.$ using $8$ helpers assigned in manual digging

Gravel Bedding $=40$ cu$.$m$.$ using $8$ helpers assigned in manual backfilling

Rebar Footing & $1^{st}$ Lift Column $=5,255$ kgs using $4$ skilled workers assigned in fabrication and $4$ skilled workers assigned in installation

Formworks for $1^{st}$ Lift Column $=58$ sq$.$m$.$ using $1$ skilled worker $+1$ helper for installation, using $1$ skilled worker $+1$ helper for fabrication

Forming and Shoring of $1^{st}$ Lift Column $=58$ sq$.$m$.$ using $1$ skilled worker $+1$ helper for forming and shoring

Concrete Pouring for footing and column $=35$ cu$.$m$.$ using $3$ helpers assigned in mixing machine, and $2$ skilled workers $+4$ helpers assigned in concrete pouring

Stripping of Forms $=58$ sq$.$m$.$ using $2$ skilled workers and $2$ helpers

Backfilling Volume $=188$ cu$.$m$.$ using $8$ helpers assigned in manual backfilling

Helper's Rate $=$ Php $598\mathrm{.}00$ per day

Skilled Worker's Rate $=$ Php $750\mathrm{.}00$ per day

Overhead $=20\%$

DETERMINE the TOTAL LABOR COST for SUBSTRUCTURE using the Philippines Manpower Productivity Ratio