Input (grade 6): Some studies done in 2001 estimated that the income from cultivating khat was about 2.5 million Yemeni rials per hectare, while it was only 0.57 million rials per hectare if fruits were cultivated.
Output (grade 4): Some studies done in 2001 estimated that the income from growing khat was about 2.5 million Yemeni rials per hectare, while it was only 0.57 million rials per hectare if fruits were grown.