Undefined line in result

Question

Hi, can you please explain me why result is OK, but second line "undefined" There fore I cannot finish this exercise.
Thanks

function main() {
var percent = parseInt(readLine(),10);
console.log(salaryIncrease(percent));
}
var salaries = [3000, 7000, 5000, 15000];
const salaryIncrease = percent =>
{var total =0;
salaries.forEach(item =>
{ total += (item/100)*percent;
});
console.log(total);
}

Answer 1

Function salaryIncrease() does not return anything, it only log <total> to console.

When you do this in main()

console.log( salaryIncrease( percent ) );

There be nothing to log cause salaryIncrease() returned nothing (undefined).

Solution:
Either just call salaryIncrease() cause it already is logging <total>, or return <total> from salaryIncrease() and log the return value in main()

Answer 2

Your output is identical to this:
console.log(console.log(total));