30,000 American dollars would probably get you 2,578,500 Pakistani rupee
The Australian dollar (different to the American, New Zealand or dollars of another country).
Australian dollars
To convert 7.5 k (7,500) to American dollars, you simply consider it as $7,500. If you meant 7.5 thousand in another currency, the conversion would depend on the current exchange rate for that currency against the US dollar. Please specify the currency if you need a more accurate conversion.
There are many websites that have currency converters. The best website to check would be Yahoo Finance. They have a currency converter that will convert US dollars to Australian dollars.
As with the rest of Austalia, people in Sydney use Australian dollars.
There was no Australian Dollar until 1966, long after the "early settlement". At the time of currency changeover from Pounds to Dollars, the Australian One Pound note converted to the Australian Two Dollar note.
Australian Dollars $
169.99 is already expressed in American dollars, as it uses the dollar sign. If you meant to convert it to another currency, please specify which one, and I can help with that conversion.
Google "currency - conversion - dollars" and the currency you are interested in.
Australian dollars.
The Australian Colonies were using the British currency in 1845 and Australian Dollars did not become the Australian currency until 1966. Ten Pounds GBP in 1845 had the purchasing power of about $1,229.98 AUD today. NOTE - This historical conversion is the result of many calculations and considerations by a purpose designed program for which I can take no credit. The resulting answer should only be regarded as an approximation.