trying to add fixed value to groups

hi all,

would really appreciate some help, ive been teaching myself powerbi for a week now and have hit a  brick wall

i am trying to show how much it costs to carry out some work per hour.

i have a long list of codes i have grouped into different work types as they all have different costs.

for the three work groups i have created i want to muliply by an hourly materials rate and then also add a fixed salary rate for the hour on there.

when i use "quick measure" to multiply the material costs (i have created them on a seperate table with the relevant user group name) with the meters worked.......it only lets me multiply the sum of all the use group material costs.

i know i am doing something very wrong, any help i would really appreciate]

lucy x