The cost of one jar of homemade jelly is less than the cost of one container of peanut butter. The cost of two containers of peanut butter is $9.00.
On the first day:
30 jars of homemade jelly + 7 containers of peanut butter = $184.00
On the second day:
15 jars of homemade jelly + 21 containers of peanut butter = $214.50
Now, let's find the cost of one jar of homemade jelly and one container of peanut butter.
Let J be the cost of one jar of homemade jelly.
Let P be the cost of one container of peanut butter.
From the first day:
30J + 7P = $184.00
From the second day:
15J + 21P = $214.50
Now, let's solve the system of equations.
Multiply the first equation by 2 to make the coefficients of J the same:
2(30J + 7P) = 2($184.00)
60J + 14P = $368.00
Now, subtract the second equation from the modified first equation:
(60J + 14P) - (15J + 21P) = $368.00 - $214.50
45J - 7P = $153.50
Now, we have a new equation:
45J - 7P = $153.50 ...(Equation 3)
Now, compare Equation 3 with the second day's equation (15J + 21P = $214.50):
45J - 7P is less than 15J + 21P.
So, the cost of one jar of homemade jelly is less than the cost of one container of peanut butter.
Now, let's find the cost of two containers of peanut butter:
2P = 2 * $4.50 = $9.00
Therefore, the cost of two containers of peanut butter is $9.00.