Luca’s coupon saved him 8 / 4 = $<<8/4=2>>2 on his sandwich.
He paid $1 for avocado on his sandwich, so the sandwich cost 8 - 2 + 1 = $<<8-2+1=7>>7.
He paid $3 for his salad, so his meal without the drink was 7 + 3 = $<<7+3=10>>10.
Thus, Luca paid 12 - 10 = $<<12-10=2>>2 for his drink.
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