Process Costing

From Colin Drury,

A department with no opening work in progress introduced 1000 units into the process ; 600 are completed, 250 are 20% complete, and 150 units are lost, consisting of 100 units of normal loss and 50 units of abnormal Lisa. Losses are detected upon completion. Material costs are £8000 (all introduced at the start of the process) and conversion costs are £4000.

My question now, normal loss value was calculated the same way as normal output. I thought that if no scrap value is given, normal loss has no value.
Could it be because of the statement ‘Losses are detected upon completion’?

Values from the book :

Work in progress =2250
Completed units =7800
Abnormal loss =650
Normal loss =1300

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