Final answer:
Harper pays $87.00 for a case of 48 glasses after a 40% trade discount from National Stemware and Accessories, calculated using the complement method.
Step-by-step explanation:
To determine how much Harper pays for a case of 48 glasses that retails for $145 using the complement method, we first calculate the complement of the 40% trade-discount rate offered by National Stemware and Accessories. The complement is 100% - 40% = 60%. So, Harper pays 60% of the retail price.
The calculation is as follows:
- Retail price of the glasses: $145
- Trade-discount rate (complement of 40%): 0.60
- Price paid by Harper: $145 * 0.60 = $87
Therefore, Harper pays $87.00 for the case of 48 glasses.