[tex]\\ \rm\longmapsto Pressure=\dfrac{Force}{Area}[/tex]
[tex]\\ \rm\longmapsto\dfrac{F_1}{F_2}=\dfrac{A_1}{A_2}[/tex]
[tex]\\ \rm\longmapsto F_1=A_1F_2/A_2[/tex]
[tex]\\ \rm\longmapsto F_1=\dfrac{0.1(100)}{0.01}[/tex]
[tex]\\ \rm\longmapsto F_1=\dfrac{10}{0.01}[/tex]
[tex]\\ \rm\longmapsto F_1=1000N[/tex]