Answer:
2 pairs
Step-by-step explanation:
The north & south sides are parallel and the east & west are parallel.
$12.49
The price right now = 0.8 * the original price
9.99 = 0.8*x
x=12.4875
x≈12.49
Sorry, I thought your problem meant that it was 20% the original price, not 20% off.
1.28571428571
9/7+1.2 in all