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A,B,C can do a piece of work in 2 days. If A starts work and after 3 days B joins, the work was completed in 3 more days . B takes 2 more days with respect to C to complete the work. In how many days B alone can complete the twice work with double efficiency?

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The difference between compound interest and simple interest on a sum for 2 year at 20% per annum is Rs 200. If the interest is compounded halfyearly, then what is the difference (in Rs) between compound and simple interest for 1st year?