what is the cost of the lumber if the thickness is 2',width is 12',lenght is 120' if the price per board foot is 80 pesos

Answer 1

are you sure it is 2 feet thick and 12 feet wide?
I will assume 2" and 12"
that is 2 board feet per foot (2 inches thick by 1 foot wide)
so 240 board feet
*80 =19,200 pesos

Answer 2

4840