Process Costing

Hello everyone, can someone help me please, i have a question on process costing- degree of completion that i’m having problem,

material input 200kg @ $4 per kg
labour input 100 hours @ $15 per hour
departmental overhead $1000
transfer to finished goods 150 kg

normal loss is 10% of input. losses are identified when the process is 50% complete.
there is no opening or closing wip
what is the total cost of a completed unit?

answer is $19.59