If Ernie's current income is 4/5 of what it used to be, then his current income is 4/5 * $6000 = $4800.
If Jack's income is now twice what Ernie used to make, then Jack's income is 2 * $6000 = $12000.
The total combined income of Ernie and Jack is $4800 + $12000 = $16800.
#### 16800
The answer is: 16800
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Ernie's current income is 4/5 of what it used to be and Jack's income is now twice what Ernie used to make, what is the total combined income of Ernie and Jack if Ernie's previous income was $6000?

### Answer:
