The instrument is hydraulic machine.
It works on pascal's law.It states that the pressure applied in an enclosed vessel transmits press are equally on all sides.
Given area of A a1 =40cm2
area of B a2 = 0.8m2 = 8000cm2
force of A f1 = 240 N
force on B = f2 = ?
using the formula,
\(\frac{F1}{A1}=\;\frac{F2}{A2}\)
F2 = 48000N