McNeil uses the high-low method of estimating costs. McNeil had total costs of $56,000 at its lowest level of activity, when 5,000 units were sold. When, at its highest level of activity, sales equaled 10,000 units, total costs were $76,500. What would McNeil estimate its total cost to be if sales equaled 8,450 units?

$34,645

$70,145

$55,500

$91,500