To find out the selling/buying price of gold, you can see it on the KoinGold marketplace menu which you can access in the KoinWorks application by following these steps:

1. Click “KoinGold” on the first page of the KoinWorks app
   
2. You can find out the selling/buying price of gold in KoinGold marketplace.
   

For further info, you can visit this page https://koinworks.com/cara-kerja-koingold/.