calcular el porcentaje de ejemplo de código js

Ejemplo 1: obtener porcentaje del número javascript

//Our number.
var number = 120;
 
//The percent that we want to get.
//i.e. We want to get 50% of 120.
var percentToGet = 50;
 
//Calculate the percent.
var percent = (percentToGet / 100) * number;
 
//Alert it out for demonstration purposes.
alert(percentToGet + "% of " + number + " is " + percent);
 
//The result: 50% of 120 is 60

Ejemplo 2: fórmula de porcentaje en javascript

const result = Math.round((data.expense / data.income) * 100)

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