The two default lines
The example haul is 40 common blocks worth 50 cash each, plus 8 rare blocks worth 750 cash each, with every multiplier at 1. The first line is 40 x 50 = 2,000 cash; the second is 8 x 750 = 6,000 cash; the output total is 8,000 cash for the haul. The illustration is the point: the 8 rare blocks are a fifth of the stack but three quarters of the value, which is exactly why the guides push you toward the depth where rare drops appear.
Those two numbers are example inputs, not claimed game values - after you reset or edit lines, everything recalculates from whatever you type.