PERCENTAGE: EXERCISE 9(C)
THIS
EXERCISE IS BASED UPON SIMPLE APPLICATION OF THE FORMULAS THAT IS
INCREASE% AND
DECREASE%.
Increase
%=Increase in value/Original value x 100 % ...............(i)
Decrease %=Decrease in value/Original value x 100 % …………(ii)
1.The price of rice rises from Rs
30 per kg to Rs 36.Find the percentage rise in the price of rice.
The
price of the rice increases from Rs 30 to Rs 36
Increase
in price =Rs 36 – Rs 30 =Rs 6
Increase %= Increase
in value / original value x 100 %
=Rs
6 /Rs 30 x 100 % [ cancel]
=20% (Ans.)
2.The
population of a small locality was 4000 in 1979 and became 4500 in 1981 .By
what percent did the population increase?
Do this sum
using the above steps
3. The price of the scooter was Rs 8000 from in 1975 .It
reduced to Rs 6000 in 1980. By what
percent did the price of the scooter reduce?
The
price of the scooter decreased from RS 8000 TO RS 6000.
Decreased
in price = RS 8000- RS 6000 = RS 2000
Decrease%= decrease
in value / original value x 100%
=RS
2000 / RS 8000 X 100%
=25%
=25%
4.Find
the resulting quantity when:
i Rs
400 is decreased by 8 %
= 8 % of RS 400
=
8/100 x RS 400
= RS
32
DECREASED IN PRICE = RS
400 – RS 32
=RS
368
ii 25
KM IS INCREASED BY 5 %
= 5% of 25 KM
= 5/
100% X 25 KM
=1.25
KM
INCREASED IN
PRICE = 25KM + 1.25KM
=26.25
KM
Do
(iii) and (iv) using above steps
5.THE POPULATION OF A VILLAGe IS DECREASED BY 12 % . IF THE ORIGINAL POPULATION WAS 25,000, FIND THE POPULATION AFTER DECREASE?
POPULATION
DECREASED = 12 % OF 25000
FOLLOW
THE STEPS OF QUES 4 NO (I)
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