Which of the following best characterizes the relationship between a general contractor and a construction manager?

a construction manager works for a general contractor.
a general contractor is a person; a construction manager is usually a company.
a construction manager subcontracts a general contractor to perform work.
a general contractor is not involved in day-to-day operations; those are managed by a construction manager.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?