Teacher Li brought 2,000 yuan to buy 15 identical telephones for the school, each at 128 yuan. How much money do you have left?
李老师带了2000元钱为学校选购15台同样的电话机，每台128元．还剩多少元？
<gadget id="calculator">128 * 15</gadget>
<output>1_920</output>

<gadget id="calculator">2_000 - 1_920</gadget>
<output>80</output>

<result>80</result>