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St George$$s Craft Brewery is a brewhouse that produces $1200$L batches of beer, averaging $2\mathrm{.}5$ batches produced and distributed per week. All of their beer is packaged in kegs for direct distribution to local restaurants and bars.

When the brewery started up$,$ the founders decided that to minimize the number of kegs that they need to handle, they would use $50$L kegs. During packaging, kegs are filled at ground level. Over the course of the week, they are loaded manually onto the bed of a pickup truck. The truck bed sits $80$cm above ground level.

Additional data:

While the specific gravity and thus weight of beer varies somewhat by type, $50$L of their most popular beer weighs $51$ kg$.$

The keg mass and dimensions are given in the attached specification from Lawson Kegs Inc.

Please make and state any additional assumptions necessary to complete the analyses below.

Finding the $50$L kegs difficult to handle, the brewery is considering moving to either $30$L or $20$L kegs. They still expect to package and distribute the same volume of beer each week. Use the LM$-$MMH spreadsheet to analyze the implications $($of each in terms of frequency of lift and carry and of the acceptability of the task$).$ Is this task safe for a single employee, or will additional staffing be required?