This proposal uses helper columns that reference a small lookup table. In M1:N2 find the lookup table which assigns numeric values of 1 to Full time and 0.75 to Part time.
Then for the helper columns array enter this formula in F2 fill across and down as far as needed.
If you aren’t familiar with array-entered formulas array enter means the formula must be committed from edit mode by simultaneously pressing and holding down Ctrl and Shift while hitting Enter.
The formula for Red in CF and for Green
Applied in the attached.
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