Formulas to Add shift penalty rates to specific times & days

Hey everybody im trying to create a complete spreadsheet that calculates all my penalty rates and need a little help with some more advanced formulas so that it calculates it automatically , listed below are my penalty rates which im hoping somebody can edit the attatched spreadsheet and help me out

Saturday - Time & a half
Sunday Double Time
Monday - Friday = Start before 07:00am 15% extra loading and finish after 19:00 is 20% loading also on monday friday anything over 8 hours is auto double time

Your help would be greatly appreciated....