An investment of $6.599.20 earns 42% interest compounded monthly over 7 years. Approximately how much interest is earned on the investment?

So @mathmate deleted my comment because "I wasn't explaining my answer" well I did

I clearly stated that you have to make educated guess and I showed how I GOT my answer

so i guess here is my "proper" answer

There is no specific formula for this, so you can make an educated guess

for example:

13*5 = 65 (this isn't right because we need a minimum of 114)

so we continue the guessing

I then next tried

13*9

I got 117,

117 is more than 113

making 9 the minimum amount of rows for the hotel parking lot

there ya go @mathmate is that clear enough?

Disjunction is OR, written like a right side up ∨.  The upside down V is conjunction, AND, written ∧.

Let's make the disjunction truth table.

A  B   A ∨ B

F  F       F

F T       T

T F       T

T T       T

A or B is true when either A is true or B is true or both.  It's false when they're both false.    That's called inclusive OR.

Answer:   C

Interestingly, in the original algebra created by Boole, he preferred exclusive OR, written A^B.   A^B is false when both A and B are true, but otherwise like inclusive OR.  When we do it this way, exclusive OR is like addition mod 2 and AND is multiplication mod 2, so the algebra of Boole was more like regular algebra than what we call Boolean algebra today.