we will use
this rule in order of operation
P: Parenthesis
E: Exponent
M: Multiplication
D: Division
A: Addition
S: Subtraction
we are given
30+2*10....
we can simplify it
now, we will check option and verify whether it is equal to 50
option-a:
3(2+3)
=3*5
=15
so, this is FALSE
option-b:
7(2+1)
=7*3
=21
so, this is FALSE
option-c:
6(3+7)
=6*10
=60
so, this is FALSE
option-d:
5(4+1)
=5*5
=25
so, this is FALSE