If someone could explain also, Thank you.

Auguste has utility of goods X, Y given by U(X, Y ) = XY + 40Y and a budget of $200 to spend on these goods. The price of X is $1, the price of Y is $1. At his optimum, what is the ratio of (optimal X) to (optimal Y) (what is Y*/X*)? When Auguste consumes this optimal bundle, he attains a utility level. Call this utility UNT. O 1) os Y' X