A rectangular grassy plot 100 m. by 70 m has a gravel path 2.5 m wide all round it on the inside. Find the cost of gravelling the path at 90 paise per sq. metre.  Choose the correct choice from the following answers
A) Rs.700 B) Rs.708.50 C) Rs.732.50 D) Rs.742.50 E) None of these
Explanation:   Area of the plot = (100 x 70) m2 = 7000 m2   Area of the plot excluding the path = [(100 - 5) * (70 - 5)] m2 = 6175 m2.   Area of the path = (7000 - 6175) m2 = 825 m2.   Cost of gravelling the path = Rs.825 * (90/100)= Rs.742.50   Answer: Option Rs.742.50
<result>D</result>
A rectangular grassy plot 100 m. by 70 m has a gravel path 2.5 m wide all round it on the inside. Find the cost of gravelling the path at 90 paise per sq. metre.