The cost price of an assembled computer is 4,000 yuan. If the business wants to make a 30% profit, how much will it sell to customers?
一台组装电脑的成本价是4000元，如果商家要有以30%的盈利，那么卖给顾客多少元．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">4_000 * (13/10)</gadget>
<output>5_200</output>

<result>5_200</result>