Rounded off to the nearest full number, it would be 3 rounds but that wouldn't make sense because 3 x 10 is 30 sooooo the answer would be 3.5 meaning you paid 1 fifth the price of 10 rounds.
Answer:
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400
because you need to divide 36/0.09=400
He has $18 left (sorry im have to type 20 letterssss)