At time $t=0$ hours a tank is full of water.  Water leaks from the tank.  At the end of every hour there is $2 \%$ less water in the tank than at the start of the hour.  The volume of water, in litres, in the tank at time $t$ hours is~$V_{t}$  Given that  $V_{0}=2000$  $V_{t+1}=kV_{t}$  write down the value of $k$. 
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