Because the inflation rate is 10% and the bank has a real rate of interest of negative 5 percent per year, then:
This refers to the specified % increase or decrease in the prices of goods during a specific time period.
With this in mind, based on the fact that the inflation rate is 10% and the bank yields a real rate of interest of negative 5 percent per year, this is done to adjust the inflation rates and because the RII is 5% which is less than the 10% inflation rate, it is best to leave it in the bank.
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