I keep getting the wrong answer. Help?

Question

The kilopascal is a unit of measure for atmospheric pressure. Suppose the atmospheric air pressure at sea level is about

9797

kilopascals. For every​ 1000-m increase in​ altitude, the pressure decreases about

11.911.9​%.

What is the approximate pressure at an altitude of

40004000

​m

Answer 1

11.9% decrease means that 88.1% remains.

4000 feet equals 4 times 1000 feet

pressure = 97(0.881)⁴