Normal reaction is \(R=8\cos28^\circ-T\sin35^\circ\). For the least T, limiting friction acts up the plane: \[T\cos35^\circ+0.2(8\cos28^\circ-T\sin35^\circ)=8\sin28^\circ.\] Hence \[T_{\min}=\frac{8(\sin28^\circ-0.2\cos28^\circ)}{\cos35^\circ-0.2\sin35^\circ}=3.33\text{ N}.\] For the greatest T, friction acts down the plane: \[T\cos35^\circ-0.2(8\cos28^\circ-T\sin35^\circ)=8\sin28^\circ,\] so \[T_{\max}=\frac{8(\sin28^\circ+0.2\cos28^\circ)}{\cos35^\circ+0.2\sin35^\circ}=5.53\text{ N}.\] Both values give a positive normal reaction.