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ICSE Notes Mathematics: Important Tips & Formulae

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Shipra Gangwar
Gokuldham High School & Junior College (GHS), Mumbai
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Class X Subject Mathematics Formulae 1.Compound Interest ( Imp chapter) S.I = PTR 100. Amt = Pri ( 1 + Rat )Time 100 Note : If you are asked to compute the interest semi-annually ( Half yearly) the above formula is to be modified, by taking time x 2, and rate 2 If the rates are given differently for the consecutive years, then For example if the rates are 8 % , 12 % and 15 % respectively, then Amt = Pri ( 1 + 8 ) ( 1 + 12 ) ( 1 +15 ) 100 100 100. Here, you need not mention time as exponent. Depreciation Certain items value will be diminished as the time passes, then it is known as depreciation. For example the value of a car, refrigerator, machinery etc. in that case. Final Value of machine = Actual value ( 1 Rat )Time 100 In population growth problems, If present population is given and asking for i) The population n yrs ago, then take Amount as Present population , and find Principal ii) The population after n yrs, then take Principal as Present population , and find Amount 2.Sales Tax & VAT. Selling price = Marked price + x % of sales tax. Selling price = Marked price x % Discount . Tax % = Tax x 100 MP Discount % = Discount x 100 MP.

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