1/5th off = 20% off
80% = $140
1% = $1.75
100% = $175
Answer is $175
Let x be the number of rocks that George have at first.
First, George have x rocks. Then, he gets 5 new rocks. So, we have:

Next, half of his rock collection is given to Susan.

Susan got 36 rocks, so the equation is
|-4| would be 4 because it is the distance from zero or absolute value