Percent and mixture problem solving

[dady172172]

Thank you i have no idea what this problem is.

By doubling each dimension, the area of a parallelogram increased from 36 square centimeters to 144 square centimeters. Find the percent increase in area.. The answer is 300% (i cheated and looked in the back of the book) but no matter what i try i can't get 300% for some reason. Its bothering me i can't do this problem.. I want to learn how to do it.

 

[Deleted member 4993]

Thank you i have no idea what this problem is.

By doubling each dimension, the area of a parallelogram increased from 36 square centimeters to 144 square centimeters. Find the percent increase in area.. The answer is 300% (i cheated and looked in the back of the book) but no matter what i try i can't get 300% for some reason. Its bothering me i can't do this problem.. I want to learn how to do it.

When you speak of dimension - I assume you are keeping the angles constant (doubling the sides).

What is the equation for area of a parallelogram that you are using?

Show us your calculations - even if those are wrong!

 

[dady172172]

I think i solved it... 36+36=72 which is 100% increase. then 72+36=108 which is 200%. then 108+36=144 which is 300%. But how do you solve this the right way?
or
144/36=4
4-1=3
add two zeros
300
and BOOM!!! i found a shortcut..

I tried this with a few other questions and it worked correctly so i don't know how to do this legit, or if i figured it out on my own.