If a homeowner is paying his mortgage at $2\mathrm{.}90\%$ per annum and his real interest rate is $1\mathrm{.}75\%,$ what is the expected inflation rate? $($Use the appropriate real interest rate formula$)$

Provide your answer in percentage form $($e$.$g$.$ an interest of $5\mathrm{.}2\%$ should be entered as $5\mathrm{.}20)$ to $2$ decimal places. Do not include any $ or $\%\text{'}$s in your response.