If the consumer price index changes from 125 in september to 150 in october, what is the rate of inflation? a. 20.0% b. 16.7% c. 9.1% d. 45.5%

The rate of inflation is analogous to the percent difference of the original to the new price. Thus, its formula is written as:

Rate of Inflation = [New price - Base price]/Base Price * 100
Rate of inflation = (150 - 125)/125 * 100 = 20%

So, the answer is A.