Li Yang's family used 60 kilowatt-hours of electricity last month, and the electricity bill was 30 yuan. Reyila's family used 45 kilowatt-hours of electricity last month. How much is the electricity bill?
李阳家上个月用了60度电，电费是30元．热依拉家上个月用了45度电，电费是多少元？
<gadget id="calculator">30 / 60</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 45</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>