Question

Assume that the population of Mexico is 128 million and that the population increases 1.01 percent annually. Assume that the population of the United States is 323 million and that the population is reduced 0.15 percent annually. Write an application that displays the populations for the two countries every year until the population of Mexico exceeds that of the United States, and display The population of Mexico will exceed the U.S. population in X years.

the answer should look something like this: they want multiple answers. there is a pattern

322, 321, 320, 319, 318, 312, 311, 310, 300, 299, 298, 297, 296, 295, 288, 287, 286

Answer 1

// Java solution for the above problem statement
import java.math.*;
import java.util.*;
class Population {
    public static void main (String[] args) {
        int mexico_population=128; // in million
        double population_increase_rate=1.01; // in percent for Mexico

        int us_population=323; // in million
        double population_decrease_rate=0.15 ; // in percent for US
        int n=1;

        while( true )
        {
            int mexico=Mexico_population(mexico_population,population_increase_rate,n);
            int us=US_population(us_population,population_decrease_rate,n);
            if(mexico<us) {
                if (n == 1) {

                } else {
                    System.out.print(", ");
                }
            }
            else {
                System.out.println();
                System.out.println("Number of years taken by Mexico to exceed US : " + n);
                break;
            }
            n++;
            System.out.print(mexico);
        }
    }
    public static int Mexico_population(int initial_pop,double rate,int n){
        int ans= (int)(initial_pop*(Math.pow((1 + (rate*0.01)),n)));
        return ans;
    }
    public static int US_population(int initial_pop,double rate,int n){
        int ans= (int)(initial_pop*(Math.pow((1 - (rate*0.01)),n)));
        return ans;
    }
}