Mr. Cheng, a primary school language teacher, started working in 1980. According to his records, his annual income in 1981 was only 650 yuan, while in 2013 his annual income was 70 times that of 1981. What math problems can you come up with and solve?
某小学语文教师程老师是1980年参加工作的，据他记录，1981年他的年收入只有650元，而2013年他的年收入是1981年的70倍．你可以提出哪些数学问题并解决吗？
<gadget id="calculator">650 * 70</gadget>
<output>45_500</output>

<result>45_500</result>