Chap 5 Percentage and its Applications.

Chap 5

Percentage and its Applications.

Some Important facts:

1.    The fraction having denominator 100 is called percent.

2.    For conversation of percent into fractional form, the term containing percentage is multiplied by    1    and is known as

                                                       100

   its simplest form.

3.    For conversation of decimal into percent, we move two places of decimal in R.H.S. of the decimal and then use symbol % with the number.

4.    For conversation of percent into decimal form in place of symbol % we move the decimal two places of L.H.S. of the number.

5.    If selling price (S.P.) > Cost price (C.P.)

   Then profit = S.P. – C.P.

6.    S.P. = C.P. + Profit

7.    C.P. = S.P. – Profit

8.    If S.P. < C.P.

  Then Loss = C.P. – S.P.

9.    C.P. = S.P. + loss

10.   S.P. = C.P. – Loss

11.   Profit % = Profit x 100

                       C.P.

  12. Loss % Loss x 100

                  C.P.

13. The sum borrowed or the sum lent is called principal.

      After using the sum borrowed for some period, the

      additional (excess) money returned as a rent for using the

      sum is known as interest (or simple interest)

14. The total money returned (including interest) is called

      amount.

Thus,                                 Amount = Principal + Interest

                                            Interest = Amount – Principal

                                            Principal = Amount – Interest

15. On the given sum, for finding the simple interest, we use

      ‘method of percentage’ and ‘unitary method’

16. We can find simple interest by the relation given below:

      Simple Interest = Principal x Rate x Time

                                                        100