const bills_coins = [1000, 500, 100, 50, 20, 10, 5, 2, 1];
const amount = 9735;
let tmp = amount;
for (let i = 0; i < 9; i++) {
console.log(bills_coins[i] + " = " + Math.trunc(tmp / bills_coins[i]));
tmp = tmp % bills_coins[i];
}
/*
run:
1000 = 9
500 = 1
100 = 2
50 = 0
20 = 1
10 = 1
5 = 1
2 = 0
1 = 0
*/