) A rectangular park is 50m long and 36m broad. A path 4m broad is

running outside the park, along its boundary. Find the cost of cementing thispath at the rate of Rs. 400 per 10 m2https://www.meritnation.com/ask-answer/question/path-2-m-wide-is-constructed-outside-the-park-find-its/simple-equations/3684841

From the link shown above you can calculate the area of the path.

Now cost of cementing the path per $10{\mathrm{m}}^{2}$ = Rs.400

So cost of cementing the path per ${\mathrm{m}}^{2}$ = $\frac{400}{10}$ = Rs.40

Therefore to find the total cost of cementing the path multiply the area of the path calculated with Rs.40

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