Find the cost of polishing the tiles. \[(Take\sqrt{14}=3.74.)\]
A) Rs. 195.64
B) Rs. 216.52
C) Rs. 287.23
D) Rs. 325.13
Correct Answer: C
Solution :
Sides of each tile are 26 cm, 20 cm and 10 cm. Semiperimeter s = 28 cm Area of each tile \[=\sqrt{s(s-a)(s-b)(s-c)}\] \[=89.76\,c{{m}^{2}}\] Area of 16 tiles \[=89.76\times 16\,c{{m}^{2}}\] \[=1436.16\,c{{m}^{2}}\] Cost of polishing the tiles at the rate of 20 p per \[c{{m}^{2}}=1436.16\times \]` 0.2 = ` 287.23
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