وَلَا شَيْءَ فِي الزِّيَادَةِ حَتَّى تَبْلُغَ أَرْبَعِينَ دِرْهَمًا، فَيَكُونَ فِيهَا دِرْهَمٌ.
Translation: Nothing is due on the excess until it reaches 40 dirhams; then one dirham becomes due on that excess.
This concerns the amount beyond the initial 200 dirhams. A completed additional block of 40 dirhams creates a further due amount.