alleryसंख्या प्रथम 20% ने वाढवली आणि नंतर 20% ने कमी केली. निव्वळ बदल आहे
A4% घट
B4% वाढ
Cकोणताही बदल नाही
D2% घट
Answer & Solution
Correct answer: A. 4% घट
**अनुक्रमिक टक्केवारी बदल:** a + b + ab/100 = 20 + (-20) +
(20)(-20)/100 = -4%.
समतुल्यपणे, 1.20 x 0.80 = 0.96 = 4% घट.
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