how to calculate percentages?

[#1]

hey

what will be the expression to calculate margin percentage for 'total sales' and 'total cost'?

i need help with the expression.

i have used variables like

margin = 'vCm'

total cost price = ' vCcost '

total sales price = ' vCs'

so here i would like to calculate the margin percentage using the above variables>>what would be the expression to calculate??

thanks

[Clever_Anjos]

Percentage are expressions that reflects the ratio of two values

So you have to divide one value by another, what are the values of the variables above?

[#3]

vCm =  sum( {<Year={'$(vCy)'}>}LineSalesAmount)-sum ({<Year={'$(vCy)'}>}CostOfGoodsSold)

vCcost =  sum( {<Year={'$(vCy)'}>}CostOfGoodsSold)

vCs = sum( {<Year={'$(vCy)'}>}LineSalesAmount)

[Clever_Anjos]

% = num(vCcost / vCs, '#,##0.00%')

[#5]

error in expression

[Clever_Anjos]

Would you mind sharing a sample of your  data