It depends on what you're looking for in a bike. You can always get a $100 so-called "Mountain Bike" from a big-box store, but these will not perform in any capacity off-road. There are a few grades (or price divisions) of mountain bikes, based on component spec. Prices also vary based on suspension. A "hardtail" (only front suspension) will be far less expensive then a full-suspension bike. Most manufacturers only produce full-suspension starting at the mid-level or enthusiast level.
Hardtail
Entry level Hardtail: $400 - $700
Mid-Level Hardtail: $800 - $1,300
Enthusiast Level Hardtail: $1,400 - $2,500
Race Level Hardtail: over $2,500
Full Suspension
Entry level: $1,000 - $1,700
Mid-Level: $1,800 - $2,300
Enthusiast: $2,400 - $3,500
Race Level: Over $3,500
That's really hard to answer, as it depends on how good stuff you want, what kind of MTB-ing you want to do, and if you're buying new or used. If you want to DH and are looking at new stuff I'd say USD 1000 (or more) for the bike, and then USD 200(or more) for protective gear
If you want to XC(cross-country) and want all new stuff you can get away with maybe half of that.
for a serious mountain bike, NOT one you can find at Walmart or such a place. anywhere from $500 to over $10,000 USD.
Approx £21 per meter for a metalled bike trail
You, A rake, A shovel, And alot of time
A good race mountain bike would cost you about $6,000 to $10,000
it will cost about 5,000 to 10,000 to build a successful dirt bike if you want to go pro
500$
It can cost anywhere from about $400 to $9,000.
$290
A Mongoose Mountaiin Bike brand new at The Bicycle Shop cost $350 in 2010
There's really no way of telling since I don't know what you think of as a good bike, and if you're asking about the cost for the factory, the cost for a single guy knocking something together in his garage, or the cost for a chain of stores.
A bajaj mountain bike is a high end full endurance bike made for off road mountain biking. Most of these high efficiency machines will run between 900 dollars all the way up to four thousand dollars.
There's really no telling. Anything from +4000 USD for a custom build to a couple of hundred for a used, entry-level bike.
100 million
You can rent an Orange Mountain Bike in the UK online at Dale's Bike Center. They have a wide range of bikes for you to choose from. On their site they will tell you basically how much the different bikes cost.
20-25 million