Answer:
Diego pays $1.40 for 4 muffins.
He can buy 8 muffins in $3.00.
Given that the cost of 12 muffins is $4.20.
So the cost of 1 muffin is 4.20/12 = $0.35.
So the cost of 4 muffins is = 4(0.35) = $1.40
In $0.35 he gets 1 muffin.
So in $3.00 he gets 3.00/0.35 = 8.571 muffins.
He can not buy fraction of muffin. So we take previous integer. That is 8.
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