The original price of a microwave oven is 800 yuan. After selling it at a 10% discount, the price is raised by 50 yuan. What is the current price?
一种微波炉原价是800元，打九折出售后，又提价50元，现价是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">800 * (9/10)</gadget>
<output>720</output>

<gadget id="calculator">720 + 50</gadget>
<output>770</output>

<result>770</result>