-the answer is $113,501,but i do not know how it is gotten

Phone Home Inc. is considering a new three-year expansion project that requires an initial fixed asset investment of $4.2 million. The fixed asset falls into Class 10 for tax purposes (CCA rate of 30 percent per year) and at the end of the three years, can be sold for $210,000 (ignore any terminal loss or CCA recovery). The project is estimated to generate $3,100,000 in annual sales, with costs of $990,000. If the project requires an initial investment in net working capital of $300,000, the project's required return is 12% and the tax rate is 35%, what is the project's NPV