A laptop computer that was originally priced at $2,400 now sells for $2,700. what is the percent of increase? I tried this and got it wrong

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30