a certain barangay has a population of 7,000 in 2000.The constant rate of increase is 12% per annum.What will be the population of the barangay in 2020?

To find the population of the barangay in 2020, we need to calculate the population growth over the 20-year period from 2000 to 2020.

First, let's calculate the population growth rate per year:
Population growth rate = 12% = 0.12

Next, let's calculate the population growth over the 20-year period:
Population growth = Population in 2000 * Population growth rate * Number of years
Population growth = 7,000 * 0.12 * 20
Population growth = 16,800

Finally, let's calculate the population in 2020:
Population in 2020 = Population in 2000 + Population growth
Population in 2020 = 7,000 + 16,800
Population in 2020 = 23,800

Therefore, the population of the barangay in 2020 will be 23,800.