P, Q, R, and S started a business with the investment are in a ratio 4 : 5 : 6 : 7. As Q and R they were paid equal salaries. The ratio of Q's and R's total annual income is 9 : 10. If the total annual profit is 84000, What is P's salary?
1
10,200
2
11,200
3
12,200
4
13,200