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 Percentage questions on increasing and decreasing

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PostSubject: Percentage questions on increasing and decreasing    Mon Feb 19, 2018 9:17 pm



Application of Formula this formula x + y + (xy)/100 is only used for continuous increased and decreased %)
(x and y  are increase take value of x and y +ve if x and y are decreases take value of x and y –ve)
If result is +ve then effect is increases and if result is –ve then effect is decreases
Ø  This formula is also applicable for this type variable formula (X ´ Y) and (X ´ Y´ Z)
 

Example1: If A’s salary first increased by 10% and then it increased by 20%, then his salary increased by:
यदि A के वेतन  में पहले 10 % की वृद्धि किया जाए तथा उसके बाद 20% की वृद्धि की जाए, तो उसके वेतन में कितना प्रतिशत की वृद्धि होगी?
Solution: x + y + (xy)/100
=10+20+(10 x 20)/100 =30+2=32%
इस formula पर आधारित निम्नलिखित प्रश्नों को solve करें |
2. If length of a rectangle is increased by 10% and width is decreased by 10%, then the effect on area is:
यदि आयत की लम्बाई में 10% की वृद्धि की जाए और चौड़ाई में 10% की कमी की जाए तो उसके क्षेत्रफल पर क्या प्रभाव पड़ेगा ?
3.If the radius of circle is increased by 200%, then the percentage change in area is:
यदि वृत्त की त्रिज्या को 200% से वृद्धि कर डी जाए, तो उसके क्षेत्रफल में कितने प्रतिशत का प्रभाव पड़ेगा ?
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Percentage questions on increasing and decreasing
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