Order of Operations Problem..?

Please Excuse My Dear Aunt Sally
Parenthesis Exponent Multiplication Division Addition Subtraction
where multiplication and division are at the same time then addition and subtraction are at the same time
assuming the equation has the last parenthesis it would look like this:
100 -[20+5(4+3(2+1))]
100 -[20+5(4+3(3)]
100 -[20+5(4+9)]
100 -[20+5(13)]
100 -[20+65]
100 -[85]
15

Order of Operations
100-525

100 - {20 + 5[4 + 3(2 + 1)]}
= 100 - {20 + 5[4 + 3(3)]}
= 100 - {20 + 5[4 + 9]}
= 100 - {20 + 5[13]}
= 100 - {20 + 65}
= 100 - 85
= 15

complete what is in the innermost parenthesis first and then work your way out.
100- [20+5(4+3(3)]
100-[20+5(4+9)]
100-[20+5(13)]
100-[20+65]
100-85
= 15

first you have forgotten a bracket.shuld be written

100-[20+5(4+3(2+1))]

100-[20+5(4+3(3))]

100-[20+5(4+9)]

100-[20+5*13]

100-[20+65]

100-85=15

first start with 2+1=3 then 4+3=7 then 7+3=10 then 20+5=25 then 25+10 =35 then 100-35=65. that should be how its done. hpoe i was some help good luck!!

=100-[20+5(4+3*3)]
=100-[20+(5*13)]
=100-[20+65]
=100-85
=15

start with 2+1 =3
then 3(3)= 9
4+9= 13
5(13) = 65
20+65= 85
100-85= 15

2 + 1 = 3
3 X 3 = 9
4 + 9 = 13
5 X 13 = 65
20 + 65 = 85
100 - 85 = 15...that's the answer !

100 - [20+5(4+3(3)]
100 - [20+5(4+9)]
100 - [20+5(13)]
100 - [20+65]
100 - [85]

Answer is 15