Macro for drop down list options with different increases

I have a master sheet in which I input my data (A7:D). In cell C2 I want to have a dropdown list with few options (A, B, C, No changes).

When I choose particular option (eg. A) macro should select the range of input data (A7:D) and multiply columns C7:C and D7:D with correspondent increase. Let's say if I choose option A it should increase column C by 10% and column D by 7%. If I choose option C it should increase/multiply column C by 12% and column D with 0% increase...And so on different criteria for each option.

There should also be an option in drop down list which would mean "No changes", because I have another macro that copies existing data on second sheet and the master sheet has to be "clean" for next inputs.

Thank you for suggestions!