Hint: you can use a CPI of 100 for the first month as the base.
Nominal intrest on the loan = (total repayment - initial loan / initial loan)*100
=(125-100 /100)*100 = 25%
Real interest rate on loan = nominal interest rate - rate of inflation
rate of inflation = (CPI current moneth- CPI last month / CPI last month)*100
= (106-100 /100)*100 = 6%
Thus, real interest rate = 25 - 6 = 19%
Total money with Alan after a month = 485 - 100 + 125 = 510
Cost of TV after a month = 1.06*500 = 530
Thus, Alan can not buy the TV in the end
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