Need to know the % of a grand total

[Michelle]

I have a problem and I can't figure out the formula. The cost is 2.99; #of
unit is 25 and total cost is $74.75. I need the % of the grand total.

Can someone please help me with this problem.

 

[Fred Smith]

If cost is in a1, and grand total is in b1, % of total is:
=a1/b1
Format as percent

Regards,
Fred.