The average monthly turnover of a certain computer mall is 70,000 yuan, and the business tax is paid at a rate of 5%. How much is the annual business tax that this shopping mall should pay?
某电脑商场的月平均营业额是7万元，按5%的税率缴纳营业税，这家商场全年应缴纳营业税多少万元？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">7 * 12 * (1/20)</gadget>
<output>21/5 = around 4.2</output>

<result>21/5 = around 4.2</result>