How can angular/typescript be used to convert a percentage value, such as 75.8%, into a number like 75.8?

I have obtained a value (for example, "75.8%") as a string from an API and I need to convert it to a number in order to apply conditions.

For instance:

<div 
   class="container" 
   [ngClass]="{
      'pos' : value > 0,
      'neg' : value < 0
   }"
   *ngIf="value"
>
   <span class="me-1">
      {{value}} % 
   </span>
                  
 </div>

Note:

Essentially, I am changing the background color to green (using class 'pos') if the value is positive and to red if the value is negative.

I attempted this conversion without success since I am unsure of how to proceed.

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