Cash Register Project feedback/app design tips(?)

Hello all :slight_smile: After quite a while i finally finished Cash Register project (yeah!! thats happiness ^___^)! but the construction feels monstrous, guess i misunderstand smth approach-wise.

Any quick thoughts/tips about what i got wrong would be much appreciated :slight_smile:

function checkCashRegister(price, cash, cid) {
  function makePrecise(num){
  return +num.toFixed(2);
  function getCidTotal(arr){
  	return arr.reduce((all,item)=>{
             return makePrecise(all);
  //coins and  bills  values
  let coins =  [["PENNY", 0.01],
              ["NICKEL", 0.05],
              ["DIME", 0.1],
              ["QUARTER", 0.25],
              ["ONE", 1],
              ["FIVE", 5],
              ["TEN", 10],
              ["TWENTY", 20],
              ["ONE HUNDRED", 100]],
 cidTotal = getCidTotal(cid);
  if(cidTotal<change){//dont have cash 4 this
    return {status: "INSUFFICIENT_FUNDS", change: []};
  }else if(cidTotal===change){//give  away  everything  we've  got
    return {status: "CLOSED", change: cid};
  }  else{
      // Here is your change, ma'am.
        let resArr=[];  	//array for change
	//action part
		for(let i=cid.length-1; i>=0; i--){//going through arr or  cid/coing length backwards
		  if(coins[i][1]<change){//find first coin which value which is less  than  change
        var coinSumOfKind=0;
          //while  we  still  have  change to give 
          //and  have  cid 
          //and  next while iter doesnt make  change negative
          change= makePrecise(change);
 		      change-= coins[i][1]; // remove coin from change
		      cid[i][1]-=coins[i][1];// remove coin from cid         
		      coinSumOfKind+=coins[i][1];// keep track of current coin total  val           
		    } resArr.push([coins[i][0],coinSumOfKind]); //push  resulting  item [coinName,sumofkind] to  arr 
    if(change>0){return {status:"INSUFFICIENT_FUNDS", change: []};}	
		return {status:"OPEN", change: resArr};