need help with # 5 please add formula and steps you did to find the answer. My answer for part 3 is PV= $1,959,443.27 thank you

Now let's assume you are 10 years into saving for your retirement, so 10 years older than what you chose as your age now and assume you earned 2% less than expected on your investments and you ended up putting away only half as much as you assumed above. Now calculate the equal annual amount you would need to save every year to still save to the amount in part 3 , assuming you can now earn the assumed investment rate. Fill in answers: Age now: 23 Age at retirement: 40 (difference between age at retirement and age now must be greater than 15 years) Age wan't to receive retirement income until (suggest between 80 and 100): 85 Investment rate: 10% Inflation rate: 3% (average rate over last 50 years =3.5%, choose a rate between 1% and 6% ) Current year's salary: $60.000 Amount you have already saved for retirement: $3000 (must be greater than $100 ) Amount you want to leave to heirs: $100,000 (must be greater than $1000 )