What is a decreased by 20% and then increased by 20% of that? show your work.

A - (20% of A) = 80% of A + (20% of (80% of A) = 96% of A

So if A is 100:

100 - (.2 * 100) = 80 + (.2 * 80) = 96

Step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

1. perpendicular

2. parallel

3. perpendicular