Karanja is considering whether to ride his bicycle to work. There is a 10% chance he will be bitten by a rabid dog if he rides his bicycle. If he is bitten, there is a 40% chance he will get rabies if

Here's a step-by-step solution:

First, let's define the events and their probabilities:

• $R$: Karanja rides the bicycle.
• $R'$: Karanja does not ride the bicycle.
• $B$: Karanja is bitten by a rabid dog.
• $B'$: Karanja is not bitten by a rabid dog.
• $T$: Karanja gets treatment after being bitten.
• $T'$: Karanja does not get treatment after being bitten.
• $Rab$: Karanja gets rabies.
• $Rab'$: Karanja does not get rabies.

Given probabilities:

• Total working days in a month = 21.