An aggregate blend is composed of 53% coarse aggregate by weight
(sp. gr. 2.702), 43% fine aggregate (sp. gr. 2.621), and 4% filler
(sp. gr. 2.779)/ the compacted specimen contains 6% asphalt binder
(sp. gr. 1.052) by weight of total mix, and has a bulk density of
145.2 lb/ft3. ignoring
absorption, computer the percent voids in total mix, percent voids
in mineral aggregate, and the percent voids filled with asphalt.

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)?