Answer:
$28
Step-by-step explanation:
The markup was 0.40×$20 = $8, so the new price is ...
$20 +8 = $28
Cannot solve fir x because traingles are not similar
11+8+12=15+10+x
31=25+x
X=31-25
X=6
(1, 3) is the answer! hope this helps