Question
Mon March 09, 2015 By: R K Jha

A  closed wooden box has outer dimensions as 10 cm x 8 cm x 7 cm.The thickness of wood is 1 cm.If 1 cm3 of wood costs Rs 2,find the total cost of the wood required to make the box.

Expert Reply
Prasenjit Paul
Tue March 10, 2015
Inner space dimensions space of space the space box equals 8 cm space cross times space 6 space cm space cross times space 5 space cm 1 space c m space h a s space t o space b e space s u b t r a c t e d space f r o m space e a c h space s i d e space o f space t h e space o u t e r space d i m e n s i o n space sin c e space t h e t h i c k n e s s space o f space t h e space w o o d space i s space space 1 c m space f r o m space a l l space s i d e s Volume space of space wooden space box space equals 10 space cross times space 8 space cross times space 7 minus 8 space cross times space 6 space cross times space 5 equals 560 minus 240 equals 320 space cm cubed If space 1 cm to the power of 3 space end exponent of space wood space costs space Rs space 2 Then space 320 space cm cubed space would space cost space equals space 320 space cross times space 2 space equals space Rs space 640
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