Let the total population of village = $$100x$$ Population of upper economic class = $$frac{30}{100} imes 100x = 30x$$ Population of lower economic class = $$6860$$ Population of middle economic class = $$frac{3}{2} imes 6860 = 10,290$$ => Population of middle and lower economic class = $$100x - 30x = 6860 + 10290$$ => $$70x = 17150$$ => $$x = frac{17150}{70} = 245$$ $$ herefore$$ Total population = 100 * 245 = 24500