Answer:
The pressure at the top of the step is 129.303 kilopascals. 
Explanation:
From Hydrostatics we find that the pressure difference between extremes of the water column is defined by the following formula, which is a particular case of the Bernoulli's Principle ( ):
):
 (1)
 (1)
 ,
,  - Total pressures at the bottom and at the top, measured in pascals.
 - Total pressures at the bottom and at the top, measured in pascals.
 - Density of the water, measured in kilograms per cubic meter.
 - Density of the water, measured in kilograms per cubic meter.
 - Height difference of the step, measured in meters.
 - Height difference of the step, measured in meters.
If we know that  ,
,  ,
,  and
 and  , then the pressure at the top of the step is:
, then the pressure at the top of the step is:




The pressure at the top of the step is 129.303 kilopascals.