Question 534363
Let {{{n}}} = number of kWh used
given:
{{{ 51.95 = .08*300 + .13n }}}
{{{ 51.95 = 24 + .13n }}}
{{{ .13n = 51.95 - 24 }}}
{{{ .13n = 27.95 }}}
{{{ n = 215 }}}
They used 215 kWh