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