In the decade prior to the 1930s, the average number of banks that failed nationally was about 70 a year. In 1929, that number rose to 600. In 1930, there were 744 in the 10 months after the stock market crash. By 1933, 11,000 banks closed.
Based on the information above, approximately _____ is the change in bank failures from the decade average during the 1920s to 1930.
a. 10%
b. 20%
c. 30%
d. 40%
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