master in a factory in Dongsheng Town made 80 parts, and the qualified rate of the parts he made was between 85 and 98%. How many qualified parts did the master make at least?
东升镇某工厂一师傅做了80个零件，他做零件的合格率在85～98%之间，这名师傅至少做多少个合格的零件．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">80 * (17/20)</gadget>
<output>68</output>

<result>68</result>