Let a pack of movie pass by Cinema A be represented with a,
and a pack of movie pass by Cinema B be represented with b.
So,
Hence, the cost per pack of movie pass by Cinema A is $5.50, while the cost per pack of movie pass by Cinema B is $5.60.
Cinema A offer per pack of movie pass is cheaper compare to Cinema B price.
So, 5.60 - 5.50 = 0.10
You save $0.10 per movie pass if you choose the cheaper offer ( Cinema A offer)