Final answer:
The question does not provide enough information to accurately calculate the total cost of Whispering Winds Corp.'s three purchases; therefore, an answer cannot be given without additional context or clarification.
Step-by-step explanation:
The question asks for the total cost of Whispering Winds Corp.'s merchandise after three purchases. To find this, we must identify the three relevant purchases from the given information.
However, the provided data is not sufficient to determine which specific purchases or combinations of amounts should be added together to get the total cost. There is no clear indication of which figures correspond to the three purchases for Whispering Winds Corp.
Without further context or additional details on which three amounts should be summed up, it is not possible to accurately calculate and provide the total cost of Whispering Winds Corps's merchandise after the three purchases. More information or clarification is needed to proceed with a solution.