Final answer:
Without the actual increased population figure provided, we cannot perform the calculation to find the previous population based on a 15% increase. The calculation method involves treating the increased population as 115% of the original and then adjusting to find 100%. The correct answer is d. Not Provided.
Step-by-step explanation:
To calculate the previous population of a city based on a 15% increase, we first assume that the increased population represents 115% of the original (100% being the original population and the 15% representing the increase). Therefore, if we divide the increased population by 115 and then multiply by 100, we get the original population before the increase.
Since the actual increased population number is not provided in the question, we cannot perform a specific calculation. However, if we had a number, the calculation would look something like this:
Original Population = (Increased Population / 115) x 100
For example, if the increased population were 10,000, then the original population would be calculated as follows:
Original Population = (10,000 / 115) x 100 = 8,695.65
Since the option d. Not Provided is among the choices, that would be the correct answer to the student's question, as we do not have the actual increased population figure to work with.