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Please help me! stuck on what to do

i'm stuck on the line for printf("Data: $%4.2f\n", 30+(y-2)*5);.

you can ignore the lines below this because it is just wrong :D

ok, so i'm suppose to create this program that tells the customers how much they pay for their phone. For the data plan, I am suppose to create a line that shows them how much they spend on the data plan. Customers pay 30$ for the first 2.0GB, then they pay 10$ for every GB or fraction thereof. I don't know how to create a line for this! (or I just suck at math :( ) Anyway, please help me!