Answer:
-4 units
Explanation:
Applying the midpoint method, Blake's income elasticity of demand for generic potato chips is determined by multiplying the change in demand (D) by his average income (I), then dividing by the product of the change in income and average demand:

Thus, Blake's income elasticity of demand equals -4 units.
Absolutely, it is quite significant. The crops grown on our agricultural lands need to be rotated appropriately to maintain the soil's fertility. When nutrients are exhausted, the soil will lose its ability to support crops, resulting in considerably lower yields for the farmer. Therefore, it’s crucial to safeguard soil nutrients at all times during the planting processes.