Answer:
$600000
Step-by-step explanation:
This case can be achieved through Perpetuity Annuity, Annuity that pay for 20 years at least.
2500 x 12 = $30000 annually
For 20 years = $600000
So if the principal of $600000 can be invested into an Annuity policy, then the payback amount of $2,500 per month for life is guaranteed although 20 years payment upfront are accepted. Investment will be made on such money to enable such financial institution to pay back the monthly payment as pre-contract agreement