Final answer:
A farmer giving 20% of his crop to a landlord is contributing to his rent fund, which is a part of the sharecropping system.
Step-by-step explanation:
When a farmer gives 20% of his crop to a landlord, he is contributing to his rent fund. This practice is a form of sharecropping, where the farmer does not own the land outright but works it in exchange for a portion of the crops produced. The portion provided to the landlord serves as payment for the use of the land. A farmer giving 20% of his crop to a landlord is contributing to his rent fund, which is a part of the sharecropping system.