As a comment says, there's not really enough information here to provide a sure way to project your bonus. That may be an intentional decision from your employer.
That said, one possible method of calculating your bonus would be to insert your rating and the growth amount into the formula for the computation. However, it seems likely that we'd also have to assume some maximum bonus, which may be based on your salary, experience, level, etc. For argument's sake (and easy computation), let's say that your maximum bonus is 10% of your salary. Then, putting all this together, the formula would be:
Bonus = Max bonus * (performance + growth)
which expands to:
Bonus = 10% * Salary * (.6 * rating + .4 * growth)
Plugging in the numbers, you get:
Bonus = 0.1 * 9540 * (0.6 * 0.7 + 0.4 * 0.04) = 415.94
However, I stress that this is speculative. To really find out, you'll have to bring it up with your employer; however, don't be surprised if they won't tell you any more.