Linear combinations of random variables — practice question

A factory’s daily masses, in kilograms, of chemicals $A$ and $B$ are represented by the independent random variables $X$ and $Y$ respectively, where $X \sim N(10.3,\ 5.76)$ and $Y \sim N(11.4,\ 9.61)$. The revenue from the chemicals is $\$2.50$ per kilogram for $A$ and $\$3.25$ per kilogram for $B$.