Normal and Abnormal Losses

Hello sir, I found a question on process costing quoting : Input =1, 000kg Normal loss =10% Output =830kg Then there was also 5% of weight loss in the process. I failed to interpret the meaning of this 5% sir. First thought it was actual loss but then actual output was already given and different to what I got. My last thought was to add the 5% and 10% to have a new normal loss percentage. Help me out please.