bank Exam Numerical Ability Simple & Compound Interest

the difference between simple interest and compound interest for 2nd year and 3rd year is Rs 100 and Rs 205 respectively . then what is the sum?

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bank Other Question

ram buys cement and mixes sand to it in the ratio 4:1(cement:sand). Ravi buys the mixture form ram and mixes sand to it in the ratio 5:3(mixture:sand). What is the final ratio of cement to sand three numbers are picked randomly from a set of first 100 natural numbers . what is the probability that at least 2 numbers will be prime no