I want someone to use the expected return rate (ER) formula to calculate the ret

I want someone to use the expected return rate (ER) formula to calculate the return rate for a Sukuk investment of £130 billion for the next 14 years (2021-2035). The £130 billion investment will come from the GCC countries (Gulf cooperation countries: Saudi Arabia, Bahrain , Qatar, Kuwait, UAE, Oman) and will be used to Help finance the British governments’  ambitious High Speed 2 (HS2) program.
Full detail for this task is attached along with an acadamic journal detailing the ER  formula to be used which can be found on page 3 onwards