a$.$ Suppose Baa$-$rated bonds currently yield $7\mathrm{.}5\%,$ while Aa$-$rated bonds yield $5\mathrm{.}5\%.$ Now suppose that due to an increase in the expected inflation rate, the yields on both bonds increase by $1\mathrm{.}5\%.$ What would happen to the confidence index? $($Round your answers to $4$ decimal places.$)$