//Do not declare variable marks. //Write your code below this line. if (marks > 90) { console.log("AA"); } else if (marks > 80 && marks <= 90){ console.log("AB") ; }else if (marks > 70 && marks <= 80){ console.log("BB"); } else if (marks > 60 && marks <= 70){ console.log("BC") ; } else if (marks > 50 && marks <= 60) { console.log("CC") ; } else if (marks > 40 && marks <= 50) { console.log("CD"); } else if (marks > 30 && marks <= 40) { console.log("DD") ; } else if (marks <= 30) { console.log("FF") ; }