Ibama received a ten-year annuity. It paid $100 at the end of each quarter for the first four years, and $35 each month for the remaining six years. Express the value at the time of the last payment in terms of annuity symbols introduced in this section if the annual effective interest rate is i for the first four years and j for the following six years. Evaluate if i D 3% and j D 4:5%.

The purchasing agent for a company that assembles and sells air-conditioning equipment in a latin american country noted that the cost of compressors has increased significantly each time they have been reordered. the company uses an eoq model to determine order size. what are the implications of this price escalation with respect to order size? what factors other than price must be taken into consideration?