Sondra had a triangular piece of land upon which she wished to construct a triangular patio. The area measured $20 \times 18 \times 15$ feet. She contacted a contractor and found it was going to cost her $3.75 per square foot to concrete the patio area.

If the contractor rounded the area of the patio to the nearest tenth of a square foot, how much will it cost Sondra to concrete the patio?

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