The rural cooperative medical insurance in a certain place stipulates that when hospitalized in a township hospital, some countries will subsidize 80% of the medical expenses above 100 yuan. Aunt Wang's medical expenses in the township hospital totaled 2,200 yuan, so she only paid (2200-100)*(1-80%)+100=520 yuan. Aunt Zhang in the same ward also participated in this kind of medical insurance. After the medical expenses were subsidized by the state, she only spent 260 yuan. If Aunt Zhang did not participate in medical insurance, how much should she pay?
某地农村合作医疗保险规定：在乡镇医院住院，医疗费在100元以上的部分国家按80%给予补助．王大妈在乡镇医院住院的医疗费共计2200元，因此她只付(2200-100)*(1-80%)+100=520元．同病房的张大妈也参加了这种医疗保险，医疗费得到国家补助后，只花了260元．假如张大妈没参加医疗保险，该付多少元？
<gadget id="calculator">260 - 100</gadget>
<output>160</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">160 / (1/5)</gadget>
<output>800</output>

<gadget id="calculator">800 + 100</gadget>
<output>900</output>

<result>900</result>