P,Q and R together earn Rs. 1620 in 9 days. P and R can earn Rs. 600 in 5 days. Q and R in 7 days can earn Rs. 910. How much amount does R can earn per day?

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P,Q and R together earn Rs. 1620 in 9 days. P and R can earn Rs. 600 in 5 days. Q and R in 7 days can earn Rs. 910. How much amount does R can earn per day?