A can finish a work in 18 days and B in 36 days. If they work on it together for 9 days, then what percent of work is left?

A can finish a work in 18 days and B in 36 days. If they work on it together for 9 days, then what percent of work is left?
1). 33.3
2). 20
3). 75
4). 25

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