Summarised Table not display values as expected

Hi all,

If tried to do a simple summarise table on the raw data table but the numbers aren't stacking up when i compare it with a simple card and filter or auto sum in excel. I'd appreicate it if you can help.

consider a dataset like the following:

Material,density,volume,weight,cost/kg

steel,7850,10,7850,50

steel,7850,20,15700,50

concrete,2400,2,4800,25

so what id like to have is a summarise table grouped by material, density, cost per kg, total weight and caluclated column for total cost, something like the following.

material, density, cost per kg, total weight, total cost

steel, 7850, 50, 23550,1177500

concrete, 2400,25,4800, 120000

Thanks in advance.