The price of onion increase by 30%.Next month the price decrease by 30% . What is the net increase or decrease per cent in the price of onion Standard = Indian class 8
CBSE Board

Let price of onions 100

100+30(30%increase)=130

Next month

130-39(30%decrease) =91

100-91 =9 (net decrease 9%)Ans

Explanation:

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when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml