JSFiddle - React, Tailwind, and code Playground

JavaScript

var ms = 0;
var currentCrashNumber = 100;
var nextIncrease = 1.25;
var userIncrease = 1.25;

var multiplierInterval = setInterval(function(){
  currentCrashNumber=currentCrashNumber + 10/(3.5/(nextIncrease - nextIncrease/1.25))/1000;

  console.log(currentCrashNumber);

  ms=ms+10;

  if(currentCrashNumber >= nextIncrease){
    console.log(ms);
    nextIncrease = nextIncrease*(userIncrease);
  }					

  if(currentCrashNumber >= 305){
    console.log('Script done in ' + ms + 'ms');
    clearInterval(multiplierInterval);
  }
}, 10);