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I'm trying to create a function to count the mortgage

I'm trying to create a function to count the mortgage

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I'm trying to create a function to count the mortgage

CREATE FUNCTION yen_11_monthlyPayment(mortage_amount numeric,apr numeric,years integer)

RETURNS numeric

language plpgsql

AS

$$

begin

RETURN power(mortage_amount *(apr / 12) * (1+(apr / 12),years * 12)/ ((1+(apr / 12), years * 12) - 1));

END;

$$ 

but when I'm trying to put the numberselect yen_11_monthlyPayment(250000.00, 0.04125, 30);and it doesn't work

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