How can I calculate the following figures for sole trader businesses?

J

Jamelia

New member
1. Sales 45,250
Opening stock 9,500
Closing stock 10,500
Gross profit 20,750
Purchase - x

2. Sales 71,250
Purchases 49,250
Closing stock 9,100
Gross profit 22,750
Opening stock - x

3. Sales 25,650
Opening stock 4,950
Purchases 13,750
Gross profit 11,550
Closing stock -x

How can I calcutate the x?
 
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