How do you calculate monthly interest (complicated)?

hello_bubbles69

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I need to calculate the interest owing on a business account.
We charge 1.5% interest per month on invoices due over 30 days.
The customer owes $4713.54 from Aug 30, $2473.22 from Sept 8, $884.32 from October 20.
How can I calcuate the current owing interest on the account?
Thank you.
 
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