The voltage and current drawn by a resistive load are measured with a $300\; V$ voltmeter of accuracy $\pm1\%$ of full scale and a $5 \;A$ ammeter of accuracy $\pm 0.5\%$ of full scale. The readings obtained are $200\; V$ and $2.5\; A$. The limiting error (in $\%$) in computing the load resistance is (up two decimal places) $\_\_\_\_\_\_\_$.