Square metal sheet

We cut out four squares of 300 mm side from a square sheet metal plate with a side of 0,7 m. Express the fraction and the percentage of waste from the square metal sheet.

Correct answer:

f =  13/49
p =  26.5306 %

Step-by-step explanation:

a=0.7 m b=300 mm m=300:1000  m=0.3 m  S1=a2=0.72=10049=0.49 m2 S2=4 b2=4 1032=259=0.36  o=S1S2=10049259=1004910036=1004936=10013=0.13 m2 f=S1o=1004910013=4913=0.2653
p=100 f=100 4913=49100 13=491300=491300%=26.5306%

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