can i have in a written form with the formula , Thanks How much will you pay to buy an asset today that will pay you $10

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can i have in a written form with the formula , Thanks
How much will you pay to buy an asset today that will pay you
$10,000 every month, with the first payment beginning nine months
from now and the last payment exactly 3 years from now? The account
pays 1% interest every month. Show supporting calculations.
Richard has just purchased an apartment at a price of $9
million. He made a downpayment of $4 million and financed the
remaining balance with a 20-year mortgage at 6% per annum,
compounded monthly.
(i) Determine the size of the fixed month-end payment
Assume the interest rate increases to 8.4% per annum, compounded
monthly immediately after the 44th payment. If Richard decides to
keep the number of remaining payments unchanged, calculate the size
of the new monthly payment.