Typical resistances of jumper wire and silver foil
I'd say, the resistance is in the order of 1-10 Ohm.

However, it heavily depends on the dimensions of the conductor. 10x longer jumper cables also have 10x the resistance.

Calculate it yourself:

$$R=\rho\cdot\frac{l}{A}$$

where \$A\$ is the cross section and \$l\$ the length of the conductor. \$\rho\$ is the specific resistance, see for example wikipedia for a table of values

I'm not sure what you mean by silver foil, but if you mean the aluminum foil used in the kitchen, it has a typical thickness of 13µm, the thicker version 18µm. So, with \$A=0.01m\cdot 13\cdot10^{-6}m=130\cdot 10^{-9}m^2\$; \$\rho=2.82\cdot10^{-8}\Omega/m\$:

$$R=2.82\cdot10^{-8}\Omega/m\cdot\frac{0.05m}{130\cdot 10^{-9}m^2}=10.8m\Omega$$

But keep in mind that the surface of aluminum has a low conductivity, and when the current enters the foil through a small surface (like you connect a crocodile clip), the real resistance can be much higher.