Each day, the office staff at Oasis Quick Shop prepares a frequency distribution and an ogive of sales transactions by dollar value of the transactions. Saturday's cumulative frequency ogive follows: 
The percentage of sales transactions on Saturday that were under $100 each was ___.
Definitions:
Progressive Taxes
A tax system in which the rate of taxation increases as the taxable amount increases, thereby placing a higher financial burden on individuals or entities with higher incomes.
Regressive Taxes
Taxes that take a larger percentage of income from low-income earners than from high-income earners, inversely related to the taxpayer's ability to pay.
Flat Tax
A tax system with a constant marginal rate, usually applied to individual or corporate income.
Federal Reserve Board
The governing body of the Federal Reserve System, which is responsible for setting monetary policy in the United States.
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