IVA and Christmas Bonus - Please help

mrcactus Forumite Posts: 122
Seventh Anniversary 10 Posts Name Dropper Combo Breaker
Hi all.
I had a reply back from my IP with regards to the extra payment I have to make from my Christmas bonus I received from work.

The breakdown of my monthly wages are as follows:
Before tax: £1413.36 + £250(bonus) = £1663.36
After tax, NI and pension (£298.42) = £1364.94

My IP says an additional payment based on that payslip is £105.57.
No matter which way I work it out, I can not come to the same figure myself. The terms in my IVA are the standard 10% additional income plus 50% of extra (or what ever it's worded as)

Unless my maths is that bad, I just can't get to the same figure. Could someone clear this up for me please?
Many thanks  :)

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