What is the function to use in excel when you want to find the cost times the number of units?

Ngrid mixes 3.6 pounds of almonds with some raisins to make a trail mix. she divides the trail mix into 12 equal portions. each portion weighs 0.7 pound. how many pounds of raisins did she use to make the trail mix? express the answer to the nearest tenth.

5/6+7/8what is the answer sealsdbdbshd

Can some one me with these questions