摘要：
DescriptionPeople in Silverland use coins.They have coins of value A1,A2,A3...An Silverland dollar.One day Tony opened his money-box and found there were some coins.He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(without change) and he known the price would not 阅读全文
摘要：
DescriptionOn January 1st 2002, The Netherlands, and several other European countries abandoned their national currency in favour of the Euro. This changed the ease of paying, and not just internationally.A student buying a 68 guilder book before January 1st could pay for the book with one 50 guilde 阅读全文