25. The cost of 3.5m of wire is Rs 59.5 . What is the cost of one metre of wire? * Your answer
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Answer:
width = 3.5 cm
r=562=28cm
R=28+3.5=31.5cm
Area of path =πR2−πr2
=π(R2−r2)=π(R+r)(R−r)
π(59.5)×3.5
=227×(59.5)×3.5=654.5
Total cost=654.5×4=2618Rs.
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