Question lacks some precise information about the cash flow. However it would be inferred IBM has a positive future investment value.
Answer:
IBM
Explanation:
Remember, the answer depends on the discounted cash flow results irrespective of which offer has lower cost.
Since IBM offers the computers for a single payment of $55,000 due at the end of four years. The Hub could reach a decision if the present value of money calculated by means of discounted cash flow is higher than the current cost of the investment, the Hub could then purchase the computers from IBM.