Acertain calling card gives you the following rate to call malaysia. there is a connection fee of $0.39 which allows you to connect for up to (but not including) one minute. for each additional minute or part of a minute, there is a $0.24 cent charge. (for example, 1 minute up to but not including 2 minutes costs $0.63.) this fare is only valid for up to (but not including) 40 minutes.
express this information as a function, where f(x) represents the amount of money charged and x represents the number of minutes which have elapsed.