2 questions about creality print 7

Print 7 is working great with my new K1C but two things about it I dont understand ,

  1. On the preview screen it says my models x, y and z dimensions and for z its telling me its 245mm tall . Now I’m printing with 0.2mm layers so im thinking theres 5 x 0.2mm in 1 mm so 245mm should be 1225 layers but its showing 1678 layers why the discrepancy ? this difference happens no matter what print i load in

  2. On the preview screen it says the x,y,z dimensions and SPEED , The speed right now says 135 , if I load in a different file but keep all the printer settings as they were I would assume that the speed would remain the same . It can be higher or lower but I cant see any correlation as to why , surely no matter what model I print if the printer speed for all models is kept the same and the layer size etc why should it say the speed will be different , In the model im on now it has the printer set to 60mm/s for first inner and outer wall and for all other l;ayers 200mm/s outer and 250mm/s inner yet on the preview page its says ..X 147.369mm Y 202.266mm Z 245.0mm and Speed 135 , In what way does 135 relate to any of the speed settings i set in the printer settings or am I missing the point somewhere

Don