Use the payout annuity formula given below:
Here P0 is the account balance , here P0=$350000.
r is the rate here r=0.0485.
k is the number of compounding periods in a year.
One year has approximately 52 weeks so k=52.
N is the number of years here N=27.
d is the periodic withdrawl which needs to be calculated.
Substitute all values in the formula to get:
So weekly withdrawl is $447.2546448 can be approximated to $447.25 to be safe.