We planned a car trip but we hadn't filled our tank with gasoline. We were ready to go at 6:40 A.M. but our local gasoline outlet that offered gasoline at 121.9 cents/litre didn't open until 7:00 A.M.

We were in a hurry so we decided to fill up on the way. 55 km. later we filled up with 40 litres at 124.9 c/l.

We got to our destination 500 km. later and filled up at 123.9 c/l.

If our car used 7 litres/ 100 km what was the cost per minute for leaving early? (cents/minute)(to 3 decimal places)

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