Lucas Company uses the weighted-average method in its process costing system.

A) $6,120.
B) $5,520.
C) $3,060.
D) $6,000.

The weighted-average method combines the costs of the beginning inventory and the costs of current production, then divides this total cost by the total equivalent units to find the cost per equivalent unit. Without specific data on the beginning inventory, units produced, costs incurred, and equivalent units, it's impossible to calculate the exact answer. However, based on the options provided and assuming the question implies A is the correct answer, it suggests that the calculation using the weighted-average method results in a cost of $6,120.