Write each fraction as a decimal. 3/11

Can some one me with these questions

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?