1. Work out the multiplier first, so: 225/90 = 2.5
Sub this into the multiplier formula which is 1/MPS and work it out logically- 2.5 = 1/MPS and switch around so it's 1/2.5 = MPS/1 . Multiply 1 by 1/25 and this gets the MPS to be 0.4. Therefore the MPC is 0.6
2. "inflation has increased simply because the CPI has increased" No. An increase in the index doesn't mean a rise in inflation ALL the time, use the proper formula. e.g 130-120/120 x100 = 8.3% increase
Answer is C imo
3. B. Higher the MPC, the higher the multiplier as higher levels of consumption creates more national income, economic growth etc as more spending is occurring. Think of it logically, the more people spend, the higher business profits are. The higher business profits are, this leads to higher incomes for individuals (leading to higher taxation revenue) and improved business confidence, which in turns leads to additional investment. In turn, this will lead to a higher level of economic growth, therefore resulting in an increase in national income.
4. A. Refer to kitchentable's working
5. D. I don't do the correct working lol, i just did it similar to rise/run. For every increase of $50 for C, this results in an increase of $100 for national income.