There are many different currencies in the world. In order to ensure consistency, certain style codes should be recognized.
As in other numeral expressions, use for a space, to avoid a line break. If you write 100 baht it will display as 100 baht, but never as 100
Prices should be listed with the currency symbol that travellers will encounter, specifically the local formatting. The currency symbol should always be prefixed. Travellers should be able to assume that symbols used for multiple currencies (like $ or £) apply to the local currency. Do not use currency codes like "USD", "EUR", or "GBP" if the symbol is established.
Some currencies have widely used abbreviations that are used like symbols in front, with a space but without a period:
If the currency name is short enough to be spelled out in full and/or lacks a commonly recognized symbol/abbreviation, it should come after the amount.
In countries where different currencies with similar names might be confused, currency codes might be commonly used in international context, and tourist business. In that case, they could also be used on Wikitravel.
If the country uses multiple currencies, including foreign ones, use the shortest unambiguous form for each. For US dollars, this is US$. For euros, it's €.
Write price ranges using a single currency symbol and a single dash.
Use a "." to mark decimals, and use a "," to separate thousands groups.
A billion is a thousand million (American style), not a million million (Commonwealth style).
When talking about the cost of an item in a country, stick to that country's currency. Do not switch between currencies. Doing so causes confusion and frustration. If you only know the price in dollars or euros, go to a currency conversion site and convert the number. Round off to nearest whole unit.
You can purchase a gift for ₹100. A taxi ride costs $10.
You can purchase a gift for ₹100. A taxi ride costs ₹450.
In some countries such as Cambodia and much of Africa, the local currency is so weak or unstable that any larger prices (like, say, hotel rooms) are quoted and paid for in a foreign currency. If this is the case, follow local convention and list those prices in the foreign currency.
In some countries such as Myanmar, foreign nationals pay a US$ price for some things (hotels, air and train tickets, entrance fees), but in local currency for other things (food, shopping, buses, pickups, taxis). In this case, it is best to list the price in the currency that the foreign traveler will use even if it means switching currencies in the body of the page.
Even when the vast majority of expenses will be paid in local currency, if the inflation rate is high enough where information will become outdated in only two or less years, use the equivalent amount in U.S. dollars. This should be consistent for all articles pertaining to the country.