Stanie and Paul take a piece of work for Rs. 28,800. One alone could do it in 36 days, the other in 48 days. With the assistance of an expert , they finish it in 12 days. How much remuneration the expert should get ?

Stanie and Paul take a piece of work for Rs. 28,800. One alone could do it in 36 days, the other in 48 days. With the assistance of an expert , they finish it in 12 days. How much remuneration the expert should get ?
1). Rs. 10000
2). Rs. 18000
3). Rs. 16000
4). Rs. 12000

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