Can anyone please help me with this:

The greater of D49 and I49 represents "Chargeable".
When Chargeable is:
1. Greater than D9 but less than E9, the value should be chargeable X D10
2. Greater than E9 but less than F9, the value should be chargeable X E10
3. Greater than F9 but less than G9, the value sholuld be chargeable X F10
4. Greater than G9, the value should be chargeable X G10

When the Chargeable X D10 or E10 or F10 or G10 is less than C10, the value
should be C10