题目内容：
10[阅读题,10分] Life assurance has existed, in one form or another, for thousands of years. When Roman soldiers were paid, part of their earnings went into a fund on their behalf. If they were in battle then this money was given to their families. Or, if they were retired from the army, they were given this money to help them start a new career. In the days when pirates used to attack ships at sea, many sea captains used to club together by putting money into a fund. Then when one of these captains was unlucky enough to get captured, money from the fund was used to pay his ransom and so get them released as soon as possible. Gradually, over the centuries, the basic principles of life assurance were growing. One very important idea or principle that began to develop was that — if life assurance was to work well — a fund of money was needed. People who wanted to have assurance would join a club or society and pay money regularly into the society’s fund each year. In this way, the fund would gradually grow, and if one of the society’s members did die there should be enough in the fund to be able to pay out the amount assured. The problem that remained was this: how much should each person put into the fund? This important question was solved by a mathematics teacher who worked in London two hundred years ago. He was James Dodson. He realized that the amount each person should pay into
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