Golang converting float64 to int error

How can I avoid floating point errors when converting float's to int's. For example the following code prints: 0.5499999999999972 when I wound expect it to print 0.55.

package main

import "fmt"

func main() {
    x := 100.55
    fmt.Println(x - float64(int(x)))    
}

Output:
0.5499999999999972