Sameer can do a piece of work in 9hours. Rahul can do the same piece of work in 8hours. Their boss asks them to work along with Ronak and hence they finish the work in 3 hours. If their boss offers them Rs. 7200 for the work, how much does Ronak earn?
A:Rs 6900
B:Rs 5000
C:Rs 4200
D:Rs 2100
Answer: D
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