To determine how much a customer is charged if a Next Up turn-in is not sent back to AT&T, let's go through the given options step-by-step.
The correct charge depends on the remaining installment balance, which refers to the total amount left to be paid on the installment plan if the device is not returned.
### Given Options:
1. Remaining 30% of total balance
2. Remaining installment balance
3. Remaining 10% of balance
4. Remaining 40% of total balance
From the options provided, the correct charge corresponds to the Remaining installment balance, which is the total unpaid amount that the customer owes for the device if it is not returned.
So, by this information:
### Solution:
The customer is charged the Remaining installment balance, which, in this particular instance, results in the total balance amount of $1000 being charged if the device is not returned.
