Please help with the question from previous Accounting paper

THIS IS THE EXACT QUESTION AS FROM PREVIOUS IGCSE EXAM PAPER

0452/12/m/j/20 MULTIPLE CHOICE QUESTION. NO INFORMATION MISSING

Gordon provided the following info for the year

Revenue $90000

Opening inventory $8000

closing inventory $2000

Mark up 50%

Gordon took goods, $7000, for own use

What were the purchases?

Option of answers to be $43000 or $47000 or $54000 or $61000

The memo of this past paper states answer to be $61000