To get ready for the move you made two trips to the local hardware store. You purchased packages of lightbulbs and packages of batteries so that you would not run out. Each package of lightbulbs was the same. Each package of batteries was the same; however, the price of the lightbulbs is different from the price of the batteries.
On your first trip, you spent $109.78 and purchased 4 packages of lightbulbs and 5 packages of batteries.
On your second trip, you spent $171.72 and purchased 6 packages of lightbulbs and 8 packages of batteries.
Enter the cost, in dollars, of a package of lightbulbs.