Three years ago a friend offered me a used typewriter for Rs. 1024. A year later

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Practice Compound Interest – Three years ago a friend offered me a used typewriter for Rs. 1024. A year later he offered me the same for Rs. 640 and last year he wanted Rs. 400 and now he is willing to sell it to me for Rs. 250. But I have decided to buy it when he reduces the price next time, If he is constantly reducing its price, at what price will he offer the typewriter to me next?

Mita and Geeta jointly start a small business Mita invests ?15,000, whereas Geet

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Practice Compound Interest – Mita and Geeta jointly start a small business Mita invests ?15,000, whereas Geeta invests ?10,000. After 2 months, Mita withdraws ?2,500 from her investment in the business. After 8 more months, Mita again withdraws ?2,500. Geeta does not withdraw any money in 1 year. After 1 year, they make a profit of ?8,100 from their business. If they want to share this profit in the ratio of their money in the business, then how much money, in ?, should Mita get as her share of the profit?