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ICSE-VIII-Mathematics

07: Percent and Percentage Class 8 Maths

with Solutions - page 2
Qstn# A-5 Prvs-QstnNext-Qstn
  • #5
    Find the percentage change, when a number is changed from : (i) 80 to 100 (ii) 100 to 80 (iii) 6.25 to 7.50
    Ans : (i) Original number = 80
    New number = 100,
    Change = (100 - 80) = 20
    ∴ Percentage change = (increase)
    = 20/80 × 100
    = 25% (ii) Original number = 100
    New number = 80
    Change (100 - 80) = 20
    ∴ Percentage change(decrease) = 20/100 × 100
    = 20% (iii) Original number = 6.25,
    New number = 7.50
    Change (Increase) = (7.50 - 6.25) = 1.25
    ∴ Increase = 1.25/6.25 × 100
    = 20%
  • #5-i
    80 to 100
    Ans : Original number = 80
    New number = 100,
    Change = (100 - 80) = 20
    ∴ Percentage change = (increase)
    = 20/80 × 100
    = 25%
  • #5-ii
    100 to 80
    Ans : Original number = 100
    New number = 80
    Change (100 - 80) = 20
    ∴ Percentage change(decrease) = 20/100 × 100
    = 20%
  • #5-iii
    6.25 to 7.50
    Ans : Original number = 6.25,
    New number = 7.50
    Change (Increase) = (7.50 - 6.25) = 1.25
    ∴ Increase = 1.25/6.25 × 100
    = 20%