Excel help for calulating hours required

Dear all,

would need your kind inputs in this, I am currently doing a model for my school assignment,

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by multiplying this, which when summed is a total of 50000, with this values,
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the following values will appear
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and the sum of the values in the table is 203360, however, when I do a separate calculation by just multiplying the 50000 with the sum of the second table, which is 50, the values will not the same as the sum of the values when multiplied individually in the table and summing them out, not sure what is the error.

Where do the numbers come from this table?

2021-02-28_5-08-13.jpg

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