Answer:
$8.7 is the price per pound of fertilizer
Explanation:
Unit rate defined as the rates are expressed as a quantity as 1 such as 3 meter per second and 4 km per hour.
As per the statement:
Edgar pays $67.86 for 7.8 pounds of fertilizer.
⇒Cost of fertilizer for 7.8 pounds = $67.86
By unit rate definition:

Simplify:

Therefore, $8.7 is the price per pound of fertilizer