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20. एक आयत की लम्बाई में 10% वृद्धि करने तथा चौड़ाई में 10% कमी करने पर इसके क्षेत्रफल में।
| कितनी वृद्धि अथवा कमी होगी?
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Step-by-step explanation:
when length x & breadth y , Then area xy
When length increased 10% means 11x/10
& breadth decreased 10% means 9y/10
then area 99xy/100
100xy/99xy = 100/99 = 1.01%
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