Read the source given below and answer the following questions:
The year 1904 was a particularly bad one for Russian workers. Prices of essential goods rose so quickly that real wages declined by 20 percent. The membership of workers' associations rose dramatically. When four members of the Assembly of Russian Workers, which had been formed in 1904, were dismissed at the Putilov Iron Works, there was a call for industrial action. Over the next few days over 110,000 workers in St. Petersburg went on strike demanding a reduction in the working day to eight hours, an increase in wages and improvement in working conditions.
When the procession of workers led by Father Gapon reached the Winter Palace it was attacked by the police and the Cossacks. Over 100 workers were killed and about 300 wounded. The incident, known as Bloody Sunday, started a series of events that became known as the 1905 Revolution. Strikes took place all over the country and universities closed down when student bodies staged walkouts, complaining about the lack of civil liberties. Lawyers, doctors, engineers and other middle class workers established the Union of Unions and demanded a constituent assembly.
Q. In the year 1904, real wages of Russian workers declined by: