Federal standard, at $7.25 per hour, remains the same
                                
                                
                                    (Newser) -
                                    Come Monday, 9.9 million minimum-wage workers in the US are due a pay raise that, by one estimate, will add $6.9 billion to their compensation per year. Increases are going into effect in 22 states,  NPR  reports. The new minimums vary widely. California, New York, and Washington are...