12x=76-20y 8x=84-20y
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Since during middle of each month, Bryce withdraws half of his amount. So at the end of each month, his balance is 1/2 times as compared to balance of his previous month.
The following recursive function represents the Brye's balance at end of each month:
where
is the account balance of previous month. And 
is the account balance of current month.
The following recursive function represents the Brye's balance at end of each month:
where