An inmate escapes from the county prison. There is a $500 reward offered for any information leading to the capture of the inmate. The county sheriff sees the inmate at a local restaurant and calls the department headquarters before arresting the inmate. The sheriff:
a. can expect to collect the $500 because he called the department headquarters before arresting the inmate.
b. cannot expect to collect the $500 because he had a preexisting duty to arrest the inmate.
c. can expect to collect the $500 because he performed a civil service.
d. cannot expect to collect the $500 because of the doctrine of unforeseen difficulties.

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.