how i can arrange money for my sister marriage?

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my sister is 22 yrs and i m 20 yrs and i m astudent of undergraduate. my father is dead. my mother is a teacher of private school . and our main problem is that our financial condition is not good .the boys who wanted to marry my sister .he said that before marriage he wanted dowry of 4 laks of rs . so how we can arrange this hard sum of money. give suggestion