Excel Price Calculator
i need a excel or a program exe format or php which caculate prices
there is 3 product :
example if ;
product a cost -200euro
product b cost +200euro
product c cost +50euro
price is 50euro
i must able to add product d or product e in future if needed
excel file is ok
but if possibel in php or exe i want pay little more
or excel and php or and exe im able pay more.