for a person who was injured or contracted a disease in the course of employment during the period from September 1, 1947 to March 31, 1951 at a workplace that regularly employs 100 or more workers, if the average amount of pay for January through March 1952 exceeds 120 percent of the monthly average amount per person of the ordinary wages paid, in the case where they worked the prescribed working hours, to workers of the same kind at the same workplace as that worker in the fiscal year that includes the day on which the person was injured or contracted the disease (hereinafter referred to in this paragraph as the "average amount of pay in the fiscal year"), that ratio;