 
 <translate> Give the step-by-step reasoning process and then the final answer. Next year, there will be twice as many people going to the fair as are going this year, and the number of people who went to the fair last year was 200 less than those going next year. If the number of people going to the fair this year is 600, calculate the number of people at the fair in the three years. <hau> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. A shekara mai zuwa, za a sami mutane ninki biyu da za su je bikin kamar yadda suke a wannan shekarar, kuma adadin mutanen da suka je bikin a shekarar da ta gabata ya yi kasa da 200 fiye da wadanda za su je a shekara mai zuwa. Idan adadin mutanen da za su je bikin a wannan shekara ya kai 600, lissafa yawan mutanen da za su je bikin a cikin shekaru uku. 