Here's our national output in the last two years.
Pakistan's GDP in 2010 was Rs. 466,555
Pakistan's GDP in 2011 was Rs. 489.436
You can tell we have our increased our output within our borders including both national and international firms by about 4.67 percent, sadly our inflation rates we adjusted at rates much higher than our GDP
Gross National Income per head = Total Income of a Nation/ Total Population
If the total population of our country as of 2011 is 177,100,000 and our total income is say around $202.831 billion ($202,831,000,000) then our national income per head for the year 2011 would have been around $1145 or Rs.104,044 or Rs. 8670 per month on average.
Now, you need to calculate the purchasing power of the Rupee, calculate the cost of goods vital for survival in a basket including food (bread, milk, eggs, chicken, etc),shelter (rent, utilities, etc), price of gas/petrol per kg or liter, and various other goods. Compare how much Rs.8670 can buy you in a month and you'll know where you stand in terms of comfort. Ofcourse the final answer is going to vary greatly and the results could be horrific.
On the brighter side - As of 2010, our Gross National Income per capita was $1,050 (please note that the "$" here is the USD) which is about Pakistani Rs. 95,411 (this is according to the current USD rate, so we will have to adjust it for inflation for 2 years i.e. add in the increase in prices from the year 2010-2012 to be exact)
So if we were making an average of $2700 in the year 2010 and $2800 in the year 2011, do you think a rise of $100 in one year means we are now richer than last year? The answer is Yes and No.
Yes, because in terms of number we did score a higher income per capita or per head however its a big NO because the Rupee also fell in value thanks to inflation which shows a steep rise in overall prices of commodities making survival on a mere Rs.8670 a nightmare.
I am assuming your question only applied to the middle-class that makes north of Rs.20 grand but practically your question meant to "Generalize" so here's your thing now, calculate the minimum living costs by collected various data on prices in different cities of Pakistan then + / - Rs.8670 with the difference. The new amount will be your minimum to live comfortably.
A few pointers to help you with:
Current inflation rate is 13.7%
Current unemployment rate is 5.6% (2011 est.)
Current GDP per Capita - $2,800 (2011 est.)
Current Public Debt - 60.1% of GDP
Commercial Bank Prime Lending Rate - 12.34% (31 December 2011 est.)
Current External Debt - $61.83 billion (31 December 2011 est.)
Current Budget according to CIA Factbook-
revenues: $26.3 billion
expenditures: $39.77 billion (2011 est.)
Now Do The Math.....