Array formula error

I have set up a google spreadsheet to determine my monthly payroll per employee.

Column F is hours worked per day, and G is employee name (only one employee per day set up as a drop down selection in each cell of column G).

I used =100*ARRAYFORMULA(SUM(IF($G$7:$G$37=ʺGuptaʺ,$F$7:$F$37,0),0)) for the first employee and =125*ARRAYFORMULA(SUM(IF($G$7:$G$37=ʺPatelʺ,$F$7:$F$37,0),0)) for the second employee and so on.

The formula works as expected for the first employee but does not get calculated for each subsequent employee.

What am I doing wrong?

What's this ARRAYFORMULA function?

I am sorry but as an excel noob I am not sure I understand your question. The idea is to calculate how much each employee is owed at the end of the month. The "100" and "125" multipliers in each formula are their pay rates.