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------------------------------------------------ The kilopascal is a unit of measure for atmospheric pressure. Suppose the atmospheric air pressure at sea level is about 98 kilopascals. For every 1000-meter increase in altitude, the pressure decreases by about 11.4%.

What is the approximate pressure at an altitude of 4000 meters?

The pressure at an altitude of 4000 meters is about ______ kilopascals.

we know that

At sea level, the height is 0 and
the pressure is 98 kilopascals

At 1000 ft, the height is 1000 and
the pressure decreases about 11.41%

i(100%-11.41%)/100----> (0.8859)

therefore
1) at 1000 ft--------> the pressure is 98*(0.8859)----------> 86.82 kilopascals
2) at 2000 ft--------> the pressure is 86.82*(0.8859)-------> 76.91 kilopascals
3) at 3000 ft--------> the pressure is 76.91*(0.8859)-------> 68.14 kilopascals
4) at 4000 ft---------> the pressure is 68.14*(0.8859)-------> 60.36 kilopascals

the answer is
The pressure at an altitude of 4000 m is about 60.36 kilopascals