7 1 8 You can also calculate this using the Fundemental Counting Principle, just do 3*2*1 which is 6 passwords
7 8 1
8 1 7
8 7 1
1 7 8
1 8 7
100 % minus 18 % is 82% or .82
So multiply the price by .82 to get the sale price
300(.82)= 246
$81.40-$9.00=$72.40
$72.40/.4 (cents)= 181 minutes
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