First of all I just rounded the cost of it in USD($$$) to $20 at that number.
509 x $20 = $10,180.00
ERROR: I messed up lol. I pertended like the ID's started at 0-509...There is actually only 411 customers (as we know for sure).
But you still messed up.
411 x $20 = $8220
Also Jumi I already have you on the list.