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$ 1 million of today's dollars would be worth $52,944 in 1800. 1 million in 1800 would be worth 18.87 million today.
401280 Rand
As of today (01APR2011), $200,000 USD is worth about 260,416 New Zealand Dollars. New Zealand does not use pounds.
The cost was about 32 million India rupees during the years 1632-1653. Back then, one rupee was worth 30 Dutch stuivers. Five stuivers were worth 6 British pence. It takes 240 pence to make a British pound. With this information you can figure that in 1640, one rupee was worth 0.15 British pounds. That means the Taj Mahal cost 4.8 million British pounds in 1640. Using an inflation calculator for the British pound, I determined that a British pound in 1640 is worth 141 British pounds today. So that means the Taj Mahal cost 678,800,000 of today's British pounds. Converting that to today's American dollars gives the Taj Mahal a cost in modern American dollars of: $1,062,834,098
Much more detail is needed. Is it a bill or a coin? What's its date? If it's a bill, is it a federally-issued bill or does it have the name of a private bank on it? If it's a coin, is it gold or silver? Please post a new, separate question with that information.
140,000 pounds
Using the GDP deflator method, 12000 British pounds would be worth 1,290,000 British pounds.
As of today (01APR2011), 2.50 Pounds is worth about $4.03 in USD.
5,000 British Pounds in 1988 would have the purchasing power of nearly Nine Thousand British Pounds today.
20 million pounds in 1833 would be worth aproximately 1.25billion pounds today (2014)
As of today (01APR2011), $60.99 US Dollars is worth about 37.84 British Pounds.
900
A British Pound in 1935 has the purchasing power of about £58 GBP today.
As of today (02APR2011), 149 Euros is worth about 131.58 British Pounds.
As of today (02APR2011), $1 US Dollar is worth about 0.62 British Pounds, or 62 Pence.
As of today (02APR2011), 188 British Pounds is worth about 212.90 Euro.
As of today (02APR2011), 14.95 Euros is worth about 13.20 British Pounds.