There is a diverse range of effects that can be caused by a change in e/r e.g (depreciation in a currency )
1. Exports are more internationally competitive but Imports are more expensive(BOGS Improvement)
2. The services sector will experience greater revenue from inbound tourism since it is...
Yes, this is true but another way to understand the concept is that because there is increased supply and assumed that demand is held at the same level(Theoretical situation.) This means that by supply and demand, the equilibrium point will fall -> Price of exchange falls(E/r)
Also, consider what you will take for year 11, you need 12 units so at least 3 more units from somewhere(I would recommend an HSIE subject [Maybe business but it's content-heavy as well as on top of eco] or chem/bio.)
2C1*(3C1)^(2)*3 = 54
When Toyota goes through the gate, they have 2 choices[Either manual gate](2C1), the other cars have 3 choices[Either automatic gates](3C1) and since two cars, it must be squared i.e. (3C1)^2
Since for all three cases, it is the same, just multiply by 3