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Eulers Step By Step Method! (Percent Error?!)

Hey guys, umm well, i understand completely the concept and how to use eulers step by step method, however it is asking me to calculator percent error.

I do not know how to do this, and so went onto the internet.
On a video i had a fomula given to me which is

[ (observed value - true value) / (true value) ] x 100

and the other site i calculated my percent error was 1.1561.

The true value was 0.28024
and my estimated value was 0.277

now when i do this myselfand multiply by 100, i get 0.11561. So what do i do???!?!? Please help last question of the chapter
Reply 1
post the question/your working out.
Reply 2
the question was fine, it was just the calculate percentage error from your answer. And i have just told you the value is calculated and the true value.
What was the answer in the back of the book?

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