function numbersDivisibleBy9(firstNum,secondNum) {
    let totalSum = 0;

    for (let divisibleNumber = firstNum; divisibleNumber <= secondNum; divisibleNumber += 1) {
        if (divisibleNumber % 9 == 0) {
            totalSum += divisibleNumber;
            //console.log(divisibleNumber)
        }
    } console.log(`The sum: ${totalSum}`)
}

numbersDivisibleBy9(100,200);