Hint: Formulas $in$ the costs section begin with $"=$Min"

Check:

$B16=500$

$E17=500$

$C18=100$

$G15=1800$

Hint: Cells $B22$:$B25$ begin with $"=$Choose"

Check: Cell $C26=6604$

Best Plan $=2$

Please provide the formulas $.$ Especially for Cost with premium