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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?

 Feb 3, 2021
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Let  the original area  = WL

 

If  the width  increased by 15%  then the new width  =1.15 W

 

If the  length decreased by 12%  its  new width =  (1 -.12)L   =  .88L

 

So....the new  area   =  

 

1.15 W  * .88 L   =    1.012 WL

 

Its area  increased   by    1.012  - 1   =   .012    =    1.2 %

 

cool cool cool

 Feb 3, 2021
edited by CPhill  Feb 3, 2021

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