Subtract the quotient of 1.6 divided by 0.8 from 99, multiply the difference by half of 10.2, what is the product?
99减去1.6除0.8的商，所得的差乘以10.2的一半，积是多少？
<gadget id="calculator">0.8 / 1.6</gadget>
<output>0.5</output>

<gadget id="calculator">99 - 0.5</gadget>
<output>98.5</output>

<gadget id="calculator">10.2 / 2</gadget>
<output>5.1</output>

<gadget id="calculator">98.5 * 5.1</gadget>
<output>502.35</output>

<result>502.35</result>