Answer the following please ! help me with this !

# 5: Filter Corp has a project available with the following cash flows:

Year	Cash Flow
0	- $ 15,800
1	5,200
2	6,500
3	5,900
4	4,300

What is the project's IRR ? Help me please !

i guessed 14.92% but i am not sure

#7: A project that will last for 7 years is expected to have equal annual cash flows of $99,400. If the required return is 8.1 percent, what is maximum initial investment would make the project acceptable?

I believe the answer is $515,747.97, please confirm this and show the full work thank you !!