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2015-09-27T19:40:11+05:30

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LET HEIGHT OF SANDY  BE X
HEIGHT OF SANDY AFTER 1  YEAR =X+{20X/100}=120X/100
HEIGHT OF SANDY AFTER 2 YEAR =120X+120X/100 *15/100=138X/100
THEREFORE INCREASE IN SANDY S HEIGHT IN 2 YEARS
={(HEIGHT AFTER 2 YEARS -HEIGHT BEFORE 2 YEARS)/HEIGHT  BEFORE 2 YEARS }*100
={(138X-X)/X}*100
=(38/100)*100=38 PERCENT
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