functions to aid stock market decision making

stocks_functions.js

function how_much_do_i_need_to_invest_to_get_x_a_month_with_z_dividend_yield(x,z){
  var yearYield = z / 100,
      monthYield=yearYield / 12,
      total = x / monthYield;
  return total;
}
// how much do i need to invest to get 1000 a month with 2.97% dividend yield
// how_much_do_i_need_to_invest_to_get_x_a_month_with_z_dividend_yield(1000, 2.97);