# Do calculation from Select Value

So, if I select Name, "john", and john's per hour rate is $100 and I want John will work in this project for 10 hours, his total cost is$1000. The main issue I am facing is, I can not make the Drop down list and assign per hour value for each name. So that, by selecting a name form the list, I get his / her per hour rate. Could you please help.