The price of A pearls is 30% less than that of B pearls, B pearls are 3,000 yuan each, how much is A pearls?
A珍珠价格比B珍珠的价格少30%，B珍珠3000元每颗，A珍珠多少钱一颗？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3_000 * (7/10)</gadget>
<output>2_100</output>

<result>2_100</result>