Find the Matrix Product Mentally, Without the Use of a Calculator

question 71

Multiple Choice

Find the matrix product mentally, without the use of a calculator or pencil-and-paper calculations.
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Definitions:

CPI

An indicator called the Consumer Price Index scrutinizes the total weighted average costs of a series of consumer goods and services, embracing sectors like food, transportation, and healthcare.

Purchasing Power

The valuation of a currency based on the volume of goods or services it can buy per unit.

CPI

The Consumer Price Index, a tool that inspects the generalized weighted average prices of a multitude of consumer services and goods, such as food, transportation, and medical services.

Consumer Price Index

A measure that examines the weighted average of prices of a basket of consumer goods and services, used as an indicator of inflation.