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OpenStudy (anonymous):
A rectangular piece of iron sheet measuring 50units by 100units is rolled into a cylinder of height 50units. If the cost of painting the cylinder is 21$ per 100 square units, then what will be the cost of painting its outer surface?
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OpenStudy (anonymous):
What have you tried so far? :)
OpenStudy (anonymous):
1050$ !!?
OpenStudy (anonymous):
Yes, that's right!
OpenStudy (anonymous):
As the calculated answer is not equal to other options, only option B is correct.<br>When the rectangular sheet is rolled into a cylinder of height 50 units, its length 100 units becomes the circumference of the circular edge of the cylinder.<br><img src='images5/q1_exp1.gif' width='469' height='122' >
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