First off, we'll convert the mixed fraction to "improper" and check about, keeping in mind that, there are 5280 feet in 1mile.

Percent markup=amountmarkedup/original times 100
amountmarkedup=25-13.5.5=11.5
original=13.5
percent markup=11.5/13.5 times 100=0.85 times 100=85% markup
A=h/2(a+b)
A=h/2a+2b
A(2a+2b)=h
Answer:
It would be nice to have the equation and/or picture, however I am giving a list of common pillow sizes for reference.
Step-by-step explanation:
Pillow size: Metric Measurements (cm) Imperial Measurements
Standard (51 x 66 cm) 20" x 26"
Queen (51 x 76 cm) 20" x 30"
King (51 x 92 cm) 20" x 36"
European square (66 x 66 cm) 26" x 26"