What is the minimum value of RL if |Io| must be less than 75 mA for |VIN| < 0.8 V?

R2 = 8.5 kΩ, R1 = 9.9 kΩ

http://i.imgur.com/Os2mjp8.png

For my attempt I used the formulas:

(Vo/Vi) = -(R2/R1)

Io = Vo/(RL || (R2+R1)

and got an answer of 9.16 ohm, but that was incorrect. (It should be 19.8 ohms)

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