By putting 8 boxes in a box, the total number of empty boxes increases by 8 - 1 = 7.
If we call x the number of times that 8 boxes have been put in a box,
we know that 11 + 7x = 102.
It follows that x=13.
In total, 11 + 13 × 8 = 115 boxes have been used.
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