Mr. Dubois purchased a car for $13,380 and paid $5,400 upfront.
The remaining amount he needs to pay is $13,380 - $5,400 = $7,980.
He plans to pay this amount in monthly installments of $420.
To find out how many months it will take for him to fully pay off the car, we divide the remaining amount by the monthly installment.
So, $7,980 / $420 = 19.
It will take Mr. Dubois 19 months to fully pay off the car.
#### 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, pays $5,400 upfront, and plans to pay the remaining amount in monthly installments of $420, how many months will it take for him to fully pay off the car?

### Answer:
