Beta version of the online book on MQL4 programming - by Sergey Kovalev (SK.) - page 12
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Here https://book.mql4.com/ru/build/lots there are missing division marks
there's
Lots_New=MathFloor(Free*Percent100One_Lot/Step)*Step;// Calculate
We need
Lots_New=MathFloor(Free*Percent/100/One_Lot/Step)*Step;// Calculate