30cm is increased by 5%
20cm is increased by 10%
Find the the percentage increase of the perimeter of the rectangle.
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Answer:
old perimeter = 30*20= 600 sq.cm
new length = 30+ 5% of 30 = 31.5
new width = 20+ 10% of 20 = 22
so,new perimeter = 31.5*22 = 693
Now,% increase
= (693-600/600)*100 = 15.5%
Answered by
0
Answer:
5% of 30 is 1.5, so it become 31.5
10% of 20 is 2, so it increased 22
normal perimeter = 2(30+20)= 100
perimeter after increasing= 2(31.5+22)= 107
so, increase in perimeter= 7%
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