If a customer pays $50.00 on a bill of $10.51, what is the change due?

To determine the change due from a payment of $50.00 on a bill of $10.51, we need to subtract the total amount of the bill from the amount paid. The calculation is as follows:

1. Start with the amount paid: $50.00.

2. Subtract the bill amount: $50.00 - $10.51.

3. Perform the subtraction:

$50.00 - $10.51 = $39.49.

Thus, the change due to the customer is $39.49. This demonstrates that the process of calculating change involves simple subtraction of the bill from the amount tendered, leading directly to the correct answer.