Size Reduction and Material Handling

Bond's work index for an agricultural mineral feed is $W_i = 12.0\text{ kWh/tonne}$. Using Bond's equation $E = 10 W_i \left(\frac{1}{\sqrt{P_{80}}} - \frac{1}{\sqrt{F_{80}}}\right)$, where $P_{80} = 100\;\mu\text{m}$ and $F_{80} = 900\;\mu\text{m}$, the specific energy required in $\text{kWh/tonne}$ is ________ (answer in integer).