Optimizing economic agents use the real interest rate when thinking about the economic costs and returns of a loan.

Suppose the rate paid by banks on savings accounts is $0\mathrm{.}45$ percent at a time when inflation is around $0\mathrm{.}95$ percent.

For the saver, the real rate of interest on his or her savings is $12\mathrm{.}7$ percent. $($Round your response to two decimal places and use a minus sign if necessary.$)$