Acustomer buys 17.01 in gas and requests one five dollar $5 lottery ticket, two one dollar $1 lottery tickets, and one $3 lottery ticket. he gives you two winning tickets to be redeemed: one for $5 and the other for $2. how much change would he receive from a $100 bill?

The customer gave you:
-- $100
-- $5 winning ticket
-- $2 winning ticket
Total . . . $107

You gave the customer:
-- $17.01 in the form of gas
-- $5 in the form of a $5 lottery ticket
-- $2 in the form of two $1 lottery tickets
-- $3 in the form of a $3 lottery ticket
Total . . . $27.01

In order to be even, you must give the customer another 

             ($107 - $27.01) = $79.99  in change

The decimal expansion would be .27 repeated