calculation problems in designer 7 - newb question :-)

[Former Community Member]

hi

it's been 2 days that i've started using adobe designer.

i've got a question to ask.

i've to make a pdf were people can insert the quantity of the desired articles and send it via email using the send by email function.

i need to make a numeric field that reports the total amount of the order's money.

for example



article 1 price: 10 euros qt: 2

article 2 price: 5 euros qt: 0

article 3 price: 7 euros qt: 1



the results of the numeric field should be

10*2 + 5*0 + 7*1 = 27



how can i do that?

sorry for my horrible english :-) thanks for your help!