Rounding up to the nearest 0.05 in JavaScript

Question

Question
Does anyone know of a way to round a float to the nearest 0.05 in JavaScript?

Example

BEFORE | AFTER
  2.51 | 2.55
  2.50 | 2.50
  2.56 | 2.60

Current Code

var _ceil = Math.ceil;
Math.ceil = function(number, decimals){
    if (arguments.length == 1)
    return _ceil(number);

    multiplier = Math.pow(10, decimals);
    return _ceil(number * multiplier) / multiplier;
}

Then elsewhere... return (Math.ceil((amount - 0.05), 1) + 0.05).toFixed(2);

Which is resulting in...

BEFORE | AFTER
  2.51 | 2.55
  2.50 | 2.55
  2.56 | 2.65

Answer 1

Multiply by 20, then divide by 20:

(Math.ceil(number*20)/20).toFixed(2)