"Polish Entrepreneurs" joke

2 Polish brothers arrive in America after a life time of poverty. With the little money they saved up they decided to open a business selling watermellons.
With a Total of 1000.00 they decided to buy a used truck valued at 900.00. With the remaining hundred they buy 100 watermelons.
Next day they decide to drive to their local city. They park the truck in front of a busy building and post a sign "
Fresh Watermelons $1.00 each"
. They sell out in one hour.
When they arrived home one of the brother's counts the money."
Hey wait a minute we made no profit we have what we started with"
The other brother says"
I know what we did wrong"
"
What we do wrong"
says the brother"
"
We needed to buy a bigger truck"