Problem on Levelling No 4 - Rise & Fall Method and Height of Instrument Method ( Sloping Ground )

The following consecutive readings were taken with a level and 4 m levelling staff on continuously sloping ground at a common interval of 20 m.
0.890, 1.645, 2.165, 2.455, 2.855, 3.185, 3.975, 1.155, 2.185, 2.865, 3.750, 1.025, 1.215, 1.840 and 2.845.
The reduced level of the first point is 800.000 m. Rule out a page of level field book and enter the above readings. Calculate the reduced levels and the gradient of the line joining the first and last points.