Farmers earn money based on the prices of the commodity they raise or grow at the time of sale.
Farming is a very complex business dependant on multiple factors including weather, equipment maintenance, commodity prices, bank rates etc. A large herd of beef cattle may start out being a good investment but bad weather, disease and a drop in beef prices at market could bankrupt a farmer in a very short time.
That depends on the farmer.
As much as he/she produces
not that much
A farmer can make 50,000 from a one acre wheat
the average farmer makes 90,000 to 150,000 a year
A rice farmer usually does not make a wage. The amount that they make depends on the size of their harvest and how much land they farm. The bigger the farm, the more they make.
a dollar 50
it depends on how much they sell
He/she makes as much crops as fit in his/her field.