For the next rsm award ceremony, it was decided to decrease the length of the main poster by 12% and to increase its width by 15%. by how many percent did the poster's area change? did it increase or decrease?

The Area of the poster has changed by +1.2%

The area has increased

Step-by-step explanation:

Lets take the initial length of the poster as , and

Initial width of the poster as .

Therefore,

Initial area of the poster =

Now after the changes to length and with:

length of the poster =

                                  =

width of the poster   =

                                  =

New Area of the poster =

=

=

=

Change in Area = Area after change - Initial Area

=

=

Percentage area change = [Change in Area / Initial Area]*100

=

=%

The area has increased

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step-by-step explanation: