Need help with formula to calculate percent of orders $500.

Question

Have data with salesperson order info.  Am already counting total number of order per salesperson and also counting and summing order count of orders with order$<500.  Can't figure out how to calculate number of orders per salesperson with order $ <$500 as percent of total number of orders per salesperson. Tried just dividing the two numbers, but got results that didn't make sense.

Answer 1

That is what I think I have tried, but keep getting errors or numbers that don't make sense. I am a new forum user, so don't know if I can actually somehow attach my report parameters to this post or if someone would be willing to call me to discuss.
When I try this code:
*Sum ({@@ordercount}, {Orders.szOutsideSPName})  % sum (Count ({Orders.szOutsideSPName}))*
I get an error message that the (Count ({Orders.szOutsideSPName})) can't be summarized.
When I try this code:
Sum ({@@ordercount}, {Orders.szOutsideSPName})  % (Count ({Orders.szOutsideSPName}))
I don't get error messages and it calculates something, but the numbers are definitely not correct (I check them with the calculator)
For example,
salesperson   total # of orders       # of orders<$500    Calculated%
1                    596                            357                      1.39
2                    290                            138                       1.40
3                   1100                            647                      6.58
I can't even figure out how those % numbers were calculated.