[填空题]
A company is going to make an excava:o6naa ,vknq ) or3zr2tion to access a mine. The cost of ex6ua b2ya*im+ l+.yta icavating is y6*at+ 2a+iliua. myb \$ 12 per $\mathrm{m}^{3}$ . The following table shows an estimate of the areas of horizontal crosssections, at 5 -metre intervals, of the underground to be removed where the height is measured in metres below the ground level.
1. Use the trapezoidal rule to find an estimate of the volume of ground to be removed，we obtain the V ≈ m$^3$ (round number)
2. Hence, or otherwise, estimate the total cost of excavation;The total cost of excavation is $\$$ .
