The best equation to show her the income from her plan is (( Tree income per hectare) x total hectares x 0.4) + (( Vegetable income per hectare) x total hectares x 0.6)
Trees will cover 40% of the field. The income would be
= Amount earned from trees per hectare x Number of hectares used by trees
Number of hectares used by trees = 40% x Total number of hectares
Income from trees will be:
= Amount earned from trees per hectare x 40% x Total number of hectares
= Tree income per hectare x 0.4 x Total hectares
Applying the same method as above:
= Amount earned from vegetables per hectare x 60% x Total number of hectares
= Vegetable income per hectare x 0.4 x Total hectares
= Sum of both
= (( Tree income per hectare) x total hectares x 0.4) + (( Vegetable income per hectare) x total hectares x 0.6)
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