My guess is as follows based on how the volume of crushed stone is estimated by tonnage, yours is solid but the volume is close as in crusher run type road base there aren't many voids in the loose material
Rock = 3'-0" long x 1'=0" tall x 2'-0" deep = 6 cu.ft. 6 cu. ft./ 27 cu.ft per cu. yd. = 0.22 of a cubic yard, round to .25 approximately 1/4 of a cubic yard of rock each stone per the size given.
If I recall correctly the conversion for quarry goods is 1 cubic yard = 1-1/2 tons or 2,500 lbs.
If you divide that 2500 lbs by 4 = 625 lbs each rock per the size given, and of course the type of rock, density, weight is going to vary.
I'm 2nd guessing if that conversion is correct, I don't order crushed stone often enough to have it stick in memory, most other goods delivered are by the cubic yard, but I thought that it was 1 1/2 tons per cubic yard, might be wrong, so don't quote me and someone please make corrections :) !
30 rocks x 625lbs ea. = 18,750 lbs/2000 = 9.375 tons say x $25 per ton = $234.37 without tax, not sure what the cost per ton is in your area, just plugged in a number, forget what it's going for here at the moment.
Hope the math works for this and is within reason. I do the same thing nice to know what you need to spend before doing so.
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