The Mixing Department's output during the period consists of $21800$ units completed and transferred out, and $6800$ units in ending work in process inventory $60\%$ complete as to materials and conversion costs. Beginning inventory is $2800$ units, $40\%$ complete as to materials and conversion costs. Assuming the weighted$-$average method, the equivalent units of production are

$28600.$

$26200.$

$25800.$

$25880.$