Take 1000 and add 40 to it. Now add another 1000. Now add 30. And another 1000. Now add 20. Now add another 1000. Now add 10. What is the total? Did you say 5,000? If so, you’re in good company. Research shows that 98 percent of people who tackle this question get that answer. But it is wrong. The correct answer is 4,100.
