For a kind of magazine, the wholesaler will wholesale it to the bookstall at a discount of 30% off the price, and the stall owner will sell it to readers at a 10% discount from the original price. If each copy of this magazine is bought at 7.2 yuan. How much does the stall owner profit from each sale.
一种杂志，批发商按定价打七折批发给书摊，摊主将原定价格降价10%卖给读者，如果这种杂志每本买7.2元．每卖出一本摊主从中盈利多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">7.2 / (9/10)</gadget>
<output>8</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">8 * (7/10)</gadget>
<output>28/5 = around 5.6</output>

<gadget id="calculator">7.2 - (28/5)</gadget>
<output>1.6</output>

<result>1.6</result>