The currency in Sri Lanka is the Rupee and AUD$1 is roughly R115. When you join a One Life trip we like to keep extra costs at a minimum and include as much as possible to make it easier for you to budget. Luckily, Sri Lanka is a cheap country for most things! You will be able to feast of the freshest seafood and homemade curries for just a few dollars, and buy fresh coconuts on the beach for pennies. An average local meal of rice and various curries will set you back around AUD$4. The local beer called Lion is delicious and costs around AUD $2 per pint.
Spending money all depends on the kind of person you are. Each person knows their own likes/dislikes and spending habits. You may like to drink cocktails in hip lounges by the beach, or crack open a local beer under a palm tree on the sand.
Tips are expected in Sri Lanka. They are not compulsory, but there is very much a tipping culture for hotels and restaurants for around 10% of the bill. We usually find it easier if your group leader says how much the tip should be and everyone can pitch in together.