Purchase cost = 710 installation cost = 70

running cost = 3 cents per hour

average hours spotlight is turned on:

spring and summer months = 180 hrs per month

autumn and winter months = 360 hrs per month

(assume the spring and summer months, and the autumn and winter months each span half of the year)

The great thing about this problem is they give you everything you need to solve it easily. so the expression is: 12h+30w12h+30wand so everywhere you have an “h” you place 66. and everywhere you have a “w” you place 33. then the expression will look like this: 12(66)+30(33)12(66)+30(33)from here you multiply and then add. getting the following of: $785,862hope this