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Answer:
Option 3, lowest price per ml
Step-by-step explanation:
Option 1, 600ml and £0.85
1ml = £0.00141667 = £0.001417
Option 2, 600 X 1.3 = 780ml and £1
1ml = £0.001282051 = £0.001282
Option 3, 600 X 1.25 = 750ml and £0.91
1ml = £0.001213333 = £0.001213