Nancy and her family used 22,5 kl of water in March 2025 and were charged R371,80 (incl VAT). Verify whether Nancy's claim is valid or invalid.

2.1 Tariff is the price per kilolitre (R/k) charged for water used in each block. 2.2 Block 2 ranges from >6 kL to 10 kL. Maximum amount of water charged in Block 2: 10\,kL - 6\,kL = 4\,kL 4 kL 2.3 Invalid 2.4 Step 1: Determine water in each block for 15 kL total usage. Block 1: First 6 kL at R10.53/kL. Block 2: Next water up to 10 kL total, so 10\,kL - 6\,kL = 4\,kL at R12.58/kL. Block 3: Remaining 15\,kL - 10\,kL = 5\,kL at R19.30/kL. Amount in Block 2 = 4 kL ≠ 3.5 kL (Nancy's claim). Step 2: Calculate correct charge for Block 2. &Charge &= &\, 4\,kL × R12.58/kL \\ &= &\, 4 × 12.58 \\ &= &\, 50.32 Correct Block 2 charge = R50.32 ≠ R40.70 (Nancy's claim). Step 3: (For completeness) Correct total bill. Block 1: &Charge &= &\, 6\,kL × R10.53/kL \\ &= &\, 6 × 10.53 \\ &= &\, 63.18 Block 2: R50.32 (from Step 2). Block 3: &Charge &= &\, 5\,kL × R19.30/kL \\ &= &\, 5 × 19.30 \\ &= &\, 96.50 Total: &Total charge &= &\, R63.18 + R50.32 + R96.50 \\ &= &\, 210.00 Actual charged = R146.70 ≠ R210.00. Nancy's claim about 3.5 kL at R40.70 (incl VAT) for Block 2 is invalid. Invalid