00:01
So here we have a question about elasticity.
00:02
We better start with the definition.
00:04
Elasticity is the percentage change in quantity over the percentage change in price.
00:09
It measures how much quantity responds to price.
00:14
Right.
00:14
So here we see that price is going from 8 to 10.
00:19
We see that quantity is going from 200 to 160.
00:25
So now it's simply a matter of filling out this formula.
00:30
And this is going to be the new quantity minus the old quantity over the old quantity, all over the new price, minus the old price, all over the new price, sorry, the old price.
00:43
Those are the definitions of percentage change.
00:46
We just need to be careful about what is old and what is new, right? it's all about just keeping the data in our heads...