An ammeter is connected in series to a battery of voltage Vb and a resistor of unknown resistance Ru (Figure 1)

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An ammeter is connected in series to a battery of voltage V_b and a resistor of unknown resistance R_u (Figure 1) . The ammeter reads a current I_o. Next, a resistor of unknown resistance R_r is connected in series to the ammeter, and the ammeter's reading drops to I₁. Finally, a second resistor, also of resistance R_r, is connected in series as well. Now the ammeter reads I₂.

If I₁/I₀=4/5, find I₂/I₀.

Express the ratio I₂/I₀ numerically.

I₂/I₀ =