jquery - Javascript floating issue with addition

I have following value which give wrong total.

let a = 86.2500;
let b = 32.3550;
alert(a+b);  //return 118.60499999999999  , expected 118.605
alert((a+b).toFixed(2))  //return 118.60   , expected 118.61

When I calculate above value with my calculator it give my expected result but javascript give me unexpected result. Why and what is solution to get expected result?

https://jsfiddle.net/vnu9fyb8/1/