formatPercent
function
Formats a number as a percentage according to locale rules.
formatPercent(value: number, locale: string, digitsInfo?: string): string
 Parameters
| value | number | The number to format. | 
| locale | string | A locale code for the locale format rules to use. | 
| digitsInfo | string | Optional. Default is  | 
Returns
string: The formatted percentage value.
See also
    © 2010–2020 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
    https://v9.angular.io/api/common/formatPercent