For most of our past mission trips this decade the exchange rate has been about 5 Hyrvnia to $1. Today it's 7.9 to 8 Hyrvnia to a dollar.
While that helps our purchasing power, when gas is up so is their costs to import. We've also noticed that prices have increased over the last few trips. What used to be dirt cheap is now just inexpensive.
For more information on Ukraine's currency and to see more pictures of their notes in circulation, check out the Wikipedia article.
Lunch is about 25 Hyrvnia according to some sources online so figure $3 to $4 and the current exchange rates.
Poland uses the Zloty as their currency. Currently the rate is about 3 to a dollar, though we won't have many places to spend money in Warsaw other than the gift shops in the tourist/historic district downtown and at the airport. All of those places will take credit cards.