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percentages and profit,loss and interest Quantitative

need some book or some study material suggestion to brush up the basics for
approaching problems on "percentages and profit,loss and interest"

thank you in advance
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    B I U Post
    10% of 20000 =2000
    so salary in 2002 =2000+ 20000=22000
    20% of 22000 = 4400
    so final salary is 26400
    its jus the basic % calculation and adding it up to original value to find the final value..
    1 1
    In 2001 ramu salary was 20000, In 2002 it is increased by 10% and again in 2003 it is increased by 20%. What is salary of ramu in 2003 ?
    I want the solution in formula based.
    :banghead::banghead::banghead::banghead:
    NileshSaha apply successive change in percentage formula i.e. a+b+ab.... 23 Aug '13.
    Trying getting hold of Time material. A second hand Quant workbook given by Time is also good enuf!!:)