The population of a city is $7.26$ lakh today. If the population has been increasing at the rate of $10\%$ per year, then two year ago, the population would have been

To find the past population, divide the current population of 7.26 lakh by (1 + r) for each year, where r is 0.10. The calculation is 7.26 divided by 1.10, and then divided by 1.10 again. This results in a population of 6 lakh two years ago.

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