I need help finding the BTIRR and ATIRR of a problem on a financial calculator, not excel.

An investor is planning to purchase a new apartment property for $1.5 million. He can obtain an 80% loan for 30 years at 10%. NOI is expected to be $500,000 in the first year and grow at a rate of 2% for the next three years along with the underlying value of the building. The building and improvements represent 80% of value and are depreciated over a 27.5 useful life for an annual depreciation allowance of $43,636. The project is expected to sell after three years, and the investors are subject to a 30% tax rate. Create pro forma cash flow statements to solve the following problems.

Thanks!