why sometimes plus operator not working correctly with some numbers in javascript and what should we do?

Question

when we use plus operator on some numbers the answer isn't correct

when i try 22.99+16.5 the result will be 39.489999999999995 but it expected to be 39.49.

let total = 22.99+16.5; //expected to be 39.49
console.log(total); //39.489999999999995