Hello, I already know that IRR of (a) is i=14.49%, but need help with (b) of this exercise.

is i=14.49%

4.6 Paul pays $5 million for a 7-year lease of a building and rented it out. He will receive $1 million rental income at the end of the first and the second year, and will receive $1.3 million at the end of the remaining years. (a) Calculate the internal rate of return of his investment. (b) Stock X is expected to generate a return of 14.5% per annum over the next 7 years. Which investment should Paul choose? Explain why