At Sweet Stuff Fresh Produce the price of a bag of grapes depends on the total number of bags purchased at 1 time, as shown in the table below. In 2 trips to Sweet Stuff this week, Janelle purchased 3 bags of grapes on Monday and 4 bags of grapes on Wednesday. How much money would Janelle have saved if she had instead purchased 7 bags of grapes in 1 trip on Monday?

$$ \begin{array}{|c|c|} \hline \text{Number of bags} & \text{Price per bag} \\ \hline 1-3 & \$3.00 \\ 4-6 & \$2.80 \\ 7-9 & \$2.60 \\ 10 \text{ or more} & \$2.50 \\ \hline \end{array} $$

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On Monday, Janelle purchased 3 bags:

$$ 3(\$3) = \$9$$

On Wednesday, Janelle purchased 4 bags:

$$ 4(\$2.80) = \$11.20 $$

Purchasing 7 bags:

$$ 7(\$2.60) = \$18.20 $$

The difference is:

$$ 9+11.2-18.2 = \boxed{2} $$