urvashi wants to polish the exterior of a cuboid wooden jewellery box as shown. if the cost of polish is 0.75 per square inch , what is the cost to polish the jewellery box?
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Given : urvashi wants to polish the exterior of a cuboid wooden jewellery box
12 in x 20 in x 5 in
cost of polish is 0.75 per square inch
To Find : cost to polish the jewellery box
300
400
600
800
Solution:
Surface area of cuboid = 2(lb + bh + lh)
l = 20 inch
b = 12 inch
h = 5 inch
Surface area = 2 ( 20 x 12 + 12 * 5 + 20 x 5)
= 2( 240 + 60 + 100)
= 2(400)
= 800
800 sq inch
cost of polish is 0.75 per square inch
cost to polish the jewellery box = 800 x 0.75
= 600 Rs
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