excel does not need to be shown just the cash flow diagram

Q3. Find the capitalized cost of a present cost of $420,000, annual costs of $40,000, and periodic costs every 8 years of $100,000 (starting from end of year 8) forever. Use an interest rate of 4% per year. (12 points) (Note: Write the formula and /or notation you are using before putting the numbers in. Show your hand calculation and solve this problem in Excel Show your cash flow diagram.)