P started a business by investing Rs 60000. After 4 months Q joined the business by investing Rs 80000. After 4 more months, R joined the business by investing Rs 100000. What will be the ratio of profits of P, Q and R at end of 2 years?

A

9 : 11 : 10

B

9 : 12 : 10

C

12 : 14 : 15

D

9 : 10 : 10