Final answer:
To calculate the next year's population with a growth rate of 0.7%, multiply the current population by 1.007.
Step-by-step explanation:
If a city's population increases by 0.7% annually, to find the next year's population in one step, you would multiply the current population by 1.007. This is because a 0.7% increase is the same as multiplying by 100% + 0.7%, which equals 100.7%. In decimal form, this is 1.007. For example, if the current population is 10,000, the population next year would be 10,000 × 1.007 = 10,070.