In a sporting goods factory, the original cost of producing a health device was 450 yuan, and the retail price was 580 yuan. Now that the production cost has been reduced by 20% after the transformation, and the profit will increase by 10% compared to the original one, how much should the retail price be set at now?
某体育用品厂，原来生产一种健康器的成本是450元，零售价是580元．现在经过改造以后生产成本下降20%，而利润要比原来再增加10%，那么现在零售价应定为多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">450 * (4/5)</gadget>
<output>360</output>

<gadget id="calculator">580 - 450</gadget>
<output>130</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">130 * (11/10)</gadget>
<output>143</output>

<gadget id="calculator">360 + 143</gadget>
<output>503</output>

<result>503</result>