The electricity rates charged by monroe utilities in the summer months are as follows: base charge = $ 8 $8 first 800 800 kwh or less at $ 0.05 $0.05/kwh over 800 800 kwh at $ 0.08 $0.08/kwh the base is a fixed monthly charge, independent of the kwh (kilowatt-hours) used during the month. a . a. find an expression for the cost function c ( x ) c(x) for usage of or under 800 800 kwh.