Final answer:
The correct amount of change for a $100.00 bill used for a $40.00 purchase is $60.00. You arrive at this answer by subtracting the purchase amount from the presented bill.
Step-by-step explanation:
The question asks for the correct amount of change when a customer presents a $100.00 bill for a $40.00 purchase. In such a transaction, the calculation is straightforward: subtract the amount of the purchase from the amount of the bill. In this scenario, you would calculate $100.00 - $40.00 to find the change due to the customer.
Performing the subtraction, we get:
$100.00
- $40.00
= $60.00
Thus, the correct option is a) Give $60.00 in change. This answer is based on basic arithmetic of subtraction used in financial transactions, which is typically covered in high school mathematics.