Using the same three 6 volt, 3.0 amp panels as above, the total output of the panels, when connected together in parallel, the voltage output would remain the same at 6 volts, but the amperage would increase to 9.0 amps (3 + 3 + 3), or 54 watts.
A monthly salary is the amount of pay you receive every month for doing your job. This also implies that you will be paid monthly, though it may not be the case. You can calculate a monthly salary even if you are paid biweekly or semi-monthly.
Each figure is a mean amount, so if wages seem a little high, you can probably blame disproportionally high salaries among each country's wealthiest. To put things in perspective, the U.S. has a mean monthly income of $4,240 according to the United Nations Economic Commission for Europe. Take a look at which Europeans are on a par with that. We've also included each nation's minimum wage, courtesy of the Federation of European Employees.