1. **Problem:** A salesperson sold 6 air-conditioning systems at $2320 each with a 12% commission rate. 2. **Step 1: Calculate total sales.** Total sales = number of systems $ \times $ price per system $$\text{Total sales} = 6 \times 2320 = 13920$$ 3. **Step 2: Calculate commission amount.** Commission rate = 12% = 0.12 Commission = total sales $ \times $ commission rate $$\text{Commission} = 13920 \times 0.12 = 1670.4$$ 4. **Answer:** - Total sales = $13920 - Commission earned = $1670.40