$\left ( {1} \right )$$0.52\times 110=57.2\left ( {元} \right )$
$\left ( {2} \right )$$\left ( {300-210} \right )\times 0.58+0.52\times 210$
$=90\times 0.58+109.2$
$=52.2+109.2$
$=161.4\left ( {元} \right )$
答：$\left ( {1} \right )$应缴电费$57.2$元；$\left ( {2} \right )$应缴电费$161.4$元.
