How can John reduce his debt by paying into a joint account with Kelly?

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Buuuka86
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TL;DR
Joint account calculations
John owes Kelly £500.

John and Kelly have a joint account. Each of them pays £200 into the account every month, to spend on joint expenses.

If Kelly pays only half of her monthly contribution into the joint account (so £100), and John pays the usual (£200) how much will John's debt (£500) be reduced by?

Just trying to work out my finances ;)
 
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Buuuka86 said:
Summary:: Joint account calculations

John owes Kelly £500.

John and Kelly have a joint account. Each of them pays £200 into the account every month, to spend on joint expenses.

If Kelly pays only half of her monthly contribution into the joint account (so £100), and John pays the usual (£200) how much will John's debt (£500) be reduced by?

Just trying to work out my finances ;)
Is this a schoolwork question?

What have you tried to do to come up with an answer?
 
It's a real life question :) I'm Kelly and my husband is John. I think the debt would be reduced by £50 every month but I'd love your help!
 
I agree.
You get the same result if you both pay $150 into the account and John gives you $50.
 
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