How to use Conditional Vlookup

Hello i need help again

In my sample workbook there are 2 tables, a)7 days & b)28 days, there are different percent in 7 day & 28 day

i need help how to use vlookup if you will choose from 2 table..
EXample in:
curing time 28 days then
age 7
percent used is in table 28 days..

then example
curing time 7 days
then age 7
percent used is in table 7 days


pls refer to my sample book thanks!!