The heat generated in a circuit is given by $\mathrm{Q}={\mathrm{I}}^2 \mathrm{Rt}$, where $\mathrm{I}$ is current, $\mathrm{R}$ is resistance, and $\mathrm{t}$ is time. If the percentage errors in measuring $\mathrm{I},\mathrm{R},$ and $\mathrm{t}$ are $2\%, 1\%$ and $1\%$ respectively, then the maximum error in measuring heat will be