What is the angle that is 30% less than the right angle.
比直角的度数少30%的角是多少度．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">90 * (3/10)</gadget>
<output>27</output>

<gadget id="calculator">90 - 27</gadget>
<output>63</output>

<result>63</result>