#6 Please Show step by step, so I can solve similar problems, thanks!

Give your answer as a whole number but do not round your calculations until you get to the final answer.

Jole uses the high-low method of estimating costs. Jole had total costs of $12,373 at its lowest level of activity, when 2,597 units were sold. When, at its highest level of activity, sales equaled 6,091 units, total costs were $28,081. Jole would estimate fixed costs as: _______