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The prices for passes for a tourist bus are shown in the table below.

pass for 1 day pass for 4 consecutive days pass for 7 consecutive days
$5 $10 $20

I will need a pass on the following days of the month: 2, 3, 4, 6, 10, 11, 12, 14, 15, 16.

How much is the cheapest valid combination I could use?