How can I correct the return amount for a non-discounted item?

arikleibo
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i did an offer like this:

from certain tag - buy 2 for 100USD

all other shoes costs 69

bought 3 pair of shoes - 2 from the certain tag for 100USD and one not.

all costs 169

the offer i manage with PIXEL UNION app.

 

now i want to do a return for only one pair. the pair with no discount.

it should return me 69/ but it calculates 169 divide to 3 and returns only 56 USD

 

how can i fix the problem?

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