Final answer:
Grant's parents donated $75 initially, calculated by subtracting the $108 earned from the bake sale from the total amount of $183.
Step-by-step explanation:
The student is asking how much money Grant's parents donated initially for his school trip. Grant sold cupcakes for $2 each and sold 54 of them.
Therefore, he collected 54 cupcakes × $2/cupcake = $108 from the bake sale.
Grant had a total of $183 after the bake sale.
To find the initial donation from his parents, we subtract the amount raised from the bake sale from the total amount: $183 total - $108 from bake sale = $75 initial donation.