Final answer:
Lucy can purchase a maximum of 40 light bulbs with $33, after accounting for the shipping charge of $2.50.
Step-by-step explanation:
Lucy orders light bulbs from a catalog where the light bulbs cost $.75 each and the shipping charge is $2.50. With $33 to spend, let's calculate how many light bulbs she can order. First, we account for the shipping charge by subtracting it from the total money Lucy has, $33.00 - $2.50 = $30.50. Then, we divide the remaining amount by the cost of one light bulb to find how many she can buy: $30.50 / $0.75 = 40.67. Since Lucy cannot buy a fraction of a light bulb, she can order a maximum of 40 light bulbs with her $33.