Pls explain the logic in this question

Hello All,

This is a final accounts preparation exam question.

Revenue 356460
Opening inventory 81201
Purchases 213699
Closing inventory 45378
Cost of sales 249522
Gross profit 106938

The trader has decided to introduce credit terms and allow customers to settle their account up to 30 days after purchase. What is the most likely figure outstanding on the trade receivables account at the year end?

The answer in the book is 128210.

I am unable to figure out how the value was arrived. Kindly explain.

Many Thanks
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