$3-$ A juice viscosity changes with its concentration $($wt$\%)$ at $20C$ as shown below.

The variation of the viscosity with concentration can be correlated by the following Eqn.

$=A{e}^{BC}$

Where A and $B$ are constants and $C$ is the wt$.\%$ concentration.

A centrifugal pump is available for delivery of the juice. The pump can handle the

fluid with a maximum viscosity of $150$mPa. Determine the maximum concentration

which can be delivered by the pump.