[填空题]
A company is going to make an excavation to access a 8/ j8olz2j vltss-wy/k1imt7 miney9o6fsh5 k:t2y0hl 8p* jikov . The cost of excavating 6y kf tk*9 y5pjhlhv 0io2:s8ois \$ 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 $\$$ .
