Suppose that resistors $R_1$ and $R_2$ are connected in parallel to give an equivalent resistor $R$. If resistors $R_1$ and $R_2$ have tolerance of $1 \%$ each, the equivalent resistor $R$ for resistors $R_1=300\: \Omega$ and $R_2 = 200 \: \Omega$ will have tolerance of
- $0.5 \%$
- $1 \%$
- $1.2 \%$
- $2 \%$