Find the average of the monthly productivity figures $($units per machine hour$).$

$15.$ Sailmaster makes high$-$performance sails for competitive windsurfers. Below

is information about the inputs and outputs for one model, the Windy $2000.$

Calculate the productivity in sales revenue$/$labor expense.

Units sold $1,217$

Sale price each $$1,700$

Total labor hours $46,672$

Wage rate $$12/$hour

Total materials $$60,000$

Total energy $$4,000$