Export two values from a drop down.

You don't need to do that. In fact, it just makes things more complicated.

One way of achieving this is to use a script as the custom validation script of the drop-down. You didn't provide any field names or actual values, so I'll just invent some:

if (event.value=="Option 1") {
    this.getField("Price").value = 100;
    this.getField("MaxAttendance").value = 20;
} else if (event.value=="Option 2") {
    this.getField("Price").value = 120;
    this.getField("MaxAttendance").value = 35;
} else if (event.value=="Option 3") {
    this.getField("Price").value = 200;
    this.getField("MaxAttendance").value = 50;
// etc.
} else {
    this.getField("Price").value = "";
    this.getField("MaxAttendance").value = "";
}

The only other thing to do is to make sure that the option to commit the selected value immediately under the dropdown's Properties - Options tab, is ticked.