New riddle posted here too.
A solo through nine, singles up each go
The first double digit, mutiplies your dough
Consecutively after, each ten gets you double
Many never attempt, saying it's too much trouble
It's a battle that cannot be won by pure strength
And yet one that is lost with the lack of length
The returns can be endless, and ultimately great
Or it can be fruitless, only from your hands escaped
To earn something big, it's worth a try
For a few hundred big ones, what am I?





