Please I will appreciate step by step maths process. All necessary information is given in the question don't ask for more. I will appreciate no gamble to this. If you take time to help with this my thumb is ready to go up!

A man borrows 10,000 to be paid back in 30 years with level end of year payments at an annual interest rate of i. The sum of principal payments in years 5 and 10 is equal to the principal repaid in year 15. Find interest rate i 9. A man borrows 10,000 to be paid back in 30 years with level end of year payments at an annual interest rate of i. The sum of principal payments in years 5 and 10 is equal to the principal repaid in year 15. Find interest rate i 9