The cost of Rs. 500 is for 1m3 .
The cost of Rs. 256 is for
\(\frac{256}{500} = \frac{128}{250}\) = \(\frac{64}{125}m^3\)
∴ Volume of the wood = \(\frac{64}{125}m^3\) = 0.512 m3
Volume = 0.512m
l3 = 0.512
l = \(3\sqrt{0.512}\)
l = 0.8 m2
= 0.8 × 100
Length of the side = 80 cm, l = 80 cm