The metro train costs $6.30 round trip to ride to work each day. you work 4 days a week (16 days a month). if you can get a monthly pass for $78, how much can you save by buying the pass?

metro train costs $6.30> $6.30
4 days>$25.2
so in a month,

4 days>$25.2
16 days >?    ($25.2 x16 )/ 4=$100.8
the difference is
$100.8-$78= $22.8

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