How much will it cost to travel to Peru in South America.?

I want to tour the Machu Picchu, and no the cost of flight, hotel, food and how much the tour will cost an ect. anything right now will be great.

Plan on spending about 500 USd

depend how many days u can stay in cusco, lima , peru ? u know ?
if u land in lima, then u would like to go by bus or plane to cusco ??, u want to watch machupicchu doing inkatrail or only with train ?? ,, depends my friend :), hotel 5 stars or , no stars ?. there are many agencys with many proices for to go n visit machupicchu :),,, the most cheap there is in the plaza de armas in cusco city :)
the inka trail , minimun its 300 dollars by person,
anyway,, take with u a credit card better :),,, and well, cash , i think 1000 dollars minimun by person ;)
check this site : www.peru.info

suerte :)

Cost of flight (around $700-800) plus about $500 a week plus probably $150 or so to get to Machu Picchu and back to Cusco and flight to Cusco will probably be somewhere between $150--$250.00 r/t. Fly, don't take the bus, to Cusco.

Cusco is relatively expensive, but you should be able to find a comfortable hotel for around $30.00 a nite.

I went a couple of years ago when the dollar was stronger against the SOL, and spent about $1500 for three weeks, including flight.

Edit:

Bruno's number is MUCH too high. Don't book anything in the U.S. except your flight and your first night hotel in Lima. You can save lots of money by going to a travel agency in Lima to get to Cusco and then to the RR station in Cusco to get ticket to MP. If you're going to stay overnight near MP--which I recommend very much, stay in Aguas Calientes but book it in Cusco before you leave or AC when you get off the train.

Also, if you want to go into the rainforest part, you need a whole bunch of vaccinations and antimalaria pills before hand. I think the yellow fever vac. alone is about $95.

2500 US Dollars for 0ne week with tour to cuzco an puerto maldonado and little tor in lima

If you travel with 1000 dollars, In Peru you would have 3000 soles, which I think is good enough