If the manufacturers chosen by Brad, Danny and Sam are using a specific algorithm they are likely to be using an economic order quantity (EOQ).
The economic order quantity can be described as the maximum or the optimal quantity that would help a company to reduce its total costs in terms of ordering and receiving inventory
The question says that the three persons are using an algorithm to know the quantity of inventory that they are to order.
Base on the scenario been described in the question, We are 95% confident that the price of a single hard drive with 33 megahertz speed and 386 CPU falls between $3,943 and $4,987
