How does the price for the 4-day Premium Safari Tour change depending on group size?

The pricing scale for the 4-day Premium Safari Tour is as follows:

• 2 pax, double occupancy: US$2,210 per person
• 3 pax, triply occupancy: US$2,020 per person
• 3 pax:
  • 2 pax, double occupancy: US$2,020 per person
  • 1 pax, single occupancy: US$2,364 per person
• 4-6 pax, double or triple occupancy: US$1,898 per person