Answer:
= 0.2

Step-by-step explanation:
The pressure on the pistons is given as;
Pressure =

So that,
Pressure on the small piston =
and Pressure on the large piston =

Thus,
=

Given that:
= 100 N,
= 2000 N,
= 4
.
=

=

=

= 0.2
= 0.2

The area of the small piston is 0.2
.