A fruit company buys 5,000 kilograms of mangoes at a price of 5.50 yuan per kilogram, and hopes to get a 15% profit after selling all of them. Please do the math for the clerk, how much is the retail price of mangoes per kilogram?
水果公司购进芒果5000千克，每千克的进价是5.50元，全部销售后希望得到15%的利润．请你帮营业员阿姨算一算，每千克芒果的零售价至少几元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">5.5 * (23/20)</gadget>
<output>6.325</output>

<result>6.325</result>