Final value - initial value : initial value * 100. What rate does the equation calculate? A) employment rate B) inflation rate C) demand rate D) supply rate

The correct option is B

Inflation is the generalized and sustained increase in the level of prices existing in the market over a period of time, a period of one year. When the general level of prices increases, less goods and services are acquired with each unit of currency. That is to say, that inflation reflects the diminution of the purchasing power of the currency: a loss of the real value of the internal medium of exchange and unit of measure of an economy.

I believe the answer is B) inflation rate but I'm not sure ...