self Maths Puzzle


Q: From 2008 – 2009, book sales decreased by 80%. If sales in 2010 were the same as they were in 2008, by what percent did they increase from 2009 – 2010?

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self Other Question

A saves 20% of his monthly salary. If his monthly expenditure is Rs 6000 then his monthly saving is a person invests Rs 12000 as fixed deposit at a bank at the rate of 10% per annum simple interest. But due to some pressing needs he has to withdraw the entire money after 3 years, for which the bank allowed him a lower rate of interest. If he gets Rs 3320 less than what he would have got at the end of 5 years, the rate of interest allowed by the bank is