Carry Trade

Can someone summarize how to solve for the profits on carry trades, with an example if possible. Thanks

  1. Borrow cheap currency
  2. Convert to investment currency at the spot exchange rate
  3. Invest investment currency at high risk-free rate.
  4. Wait. Patiently.
  5. Convert investment currency (plus interest) to cheap currency at the (current) spot exchange rate
  6. Pay off cheap currency loan
  7. Party with your profits