Add the 15% Sales tax or VAT to the tax free value of 781.07. Value with tax ≈ 898.23 Added tax ≈ 117.16. Detailed answer: Value with tax = Tax free value + 15% × Tax free value = (1 + 15%) × Tax free value = (1 + 15%) × 781.07 = (100% + 15%) × 781.07 = 115% × 781.07 = 1.15 × 781.07 = 898.2305 ≈ 898.23 Added tax = 898.2305 - 781.07 = 117.1605 ≈ 117.16 .