Answer:
3/8 % = 37.5 %
Step-by-step explanation:
Let length = l
width = w
length = 3 times width = 3w
Area of the land = 75 sq. m
Area = length × width = 3w×w = 75
3w²=75
w²=25
w=5 m
length = 3×15 = 15m
Now lets make the figure with the path of width x meters
(Refer the attached figure for easy understanding)
The inner length is the length of the rectangle reduced by x meters on either side due to the path
that is 15-x-x = 15-2x
the inner width is the width reduced by x meters in either side
= 5-x-x = 5-2x
Now lets calculate the inner area = inner length × inner width
(15-2x)×(5-2x)
= 
=
sq. m
Now the function to calculate the cost
f(x) is given by $3.00 × area of the inner land
f(x) = 3 × {75-40x+4x²)
= 225-120x+12x²
or
= 12x²-120x+225
<h3>Rs 624</h3>
Step-by-step explanation:
Here, principl (P) = Rs 5200,
Rate (R) = 4%,
Time (T) = 3yrs
Now,
Interest formula = PRT/100
= 5200*4*3/100
= Rs 624
Amount = Principle + simple Interest
= 5200 + 624
= Rs 5824
<h3>Hope it helps :)</h3>