PEMDAS:How to solve this exercise? I have the following problem:
$$100*\left\{24+100*[1001-4*(25*6+25*4)]\right\}$$
I'm very frustrated that I can't solve exercises like this. I have read about PEMDAS and followed the steps but somehow I am making a mistake because the result I get is not correct.(looked at answers in the book).
Can someone provide the steps in order to solve correctly this problem?
 A: $\newcommand{\myemph}[1]{{\color{red}{\bf #1}}}$
$$100*\left\{24+100*[1001-4*(\myemph{25*6}+\myemph{25*4})]\right\}$$
$$100*\left\{24+100*[1001-4*(\myemph{150+100})]\right\}$$
$$100*\left\{24+100*[1001-\myemph{4*(250)}]\right\}$$
$$100*\left\{24+100*[\myemph{1001-1000}]\right\}$$
$$100*\left\{24+\myemph{100*[1]}\right\}$$
$$100*\left\{\myemph{24+100}\right\}$$
$$\myemph{100*\left\{124\right\}}$$
$$\fbox{12400}$$
A: First, do the innermost products, $25*6$ and $25*4$. Then add them. Then multiply the result by $4$. Then subtract this from $1001$. Then multiply the answer by $100$. Then add $24$. Then multiply the result of that by $100$.
Or:


*

*You will need to multiply $100$ by the result of what is in curly brackets; 


*

*What is in curly brackets requires you to add $24$ to the result of multiplying $100$ by the answer you get from inside the square brackets;
-What is inside the square brackets requires you to start with $1001$, and subtract the result of multiplying $4$ by the result of what you have inside the round parentheses.


*

*To compute what is inside the round parentheses, you first do the products ($25$ times $6$ and $25$ times $4$), and add them.




Now "unfold" that to get the answer.
