A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?

They show how to do this on this page.A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?

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```
table:
| amt | rate | total
--------------------------
$ | x | 0.03 | 0.03x
twice | 2x | 0.09 | 0.18x
total | 3x | NA | 315
```