Telephone Sellers Inc. sells prepaid telephone cards to customers. Telephone Sellers then pays the telecommunications company, TeleExpress, for the actual use of its telephone lines related to the prepaid telephone cards. Assume that Telephone Sellers sells $4,000 of prepaid cards in January 2020. It then pays TeleExpress based on usage, which turns out to be 50% in February, 30% in March, and 20% in April. The total payment by Telephone Sellers for TeleExpress lines over the 3 months is $3,000.

Jenny​ walters, who owns a real estate​ agency, bought an old house to use as her business office. she found that the ceiling was poorly insulated and that the heat loss could be cut significantly if six inches of foam insulation were installed. she estimated that with the​ insulation, she could cut the heating bill by​ $80 per month and the​ air-conditioning cost by​ $70 per month. assuming that the summer season is three months​ (june, july, and​ august) of the year and that the winter season is another three months​ (december, january, and​ february) of the​ year, how much can jenny spend on insulation if she expects to keep the property for five​ years? assume that neither heating nor​ air-conditioning would be required during the fall and spring seasons. if she decides to install the​ insulation, it will be done at the beginning of may.​ jenny's interest rate is​ 6% compounded monthly.