The remaining amount that Mr. Dubois needs to pay off is $13,380 - $5,400 = $7,980.
If Mr. Dubois makes monthly payments of $420, then he needs to pay off $7,980 / $420 = 19 months.
#### 19
The answer is: 19
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Mr. Dubois purchases a new car for $13,380 and initially pays $5,400, how many months will it take for him to fully pay off the remaining amount by making monthly payments of $420?

### Answer:
