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Practice, difficulty 2 of 3

Average price paid per unit

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A hospital's procurement team bought the same disposable item in four orders:

Order	Units	Price per unit (SAR)
1	87	15.74
2	219	14.58
3	42	14.82
4	279	14.13

What was the average price paid per unit across all four orders? Give it in SAR to 2 decimal places.