Design calculations for thickness of plate?

Am doing a mini project where in a trolley is designed to carry 200kgs of weight and runs on electricity. Now the cast steel plate mounted above the motor and shaft has to be designed such that it should carry 200kgs of weight. I need to know how to calculate the minimum thickness of that plate. The plate... show more Am doing a mini project where in a trolley is designed to carry 200kgs of weight and runs on electricity. Now the cast steel plate mounted above the motor and shaft has to be designed such that it should carry 200kgs of weight. I need to know how to calculate the minimum thickness of that plate.
The plate dimensions are 1.2m length and .65m width..........
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