When we look at the picture, we realize that you copied the problem wrong. The perimeter is 34 meters, not 3 meters.
The rectangle is 15 meters long and 2 meters wide .
The area is (15 x 2) = 30 square meters.
The perimeter is (15 + 2 + 15 + 2) = 43 meters.
Given the area of 30 square meters and a perimeter of 3 meters, there are no dimensions for a rectangle that satisfy both conditions since the calculated discriminant is negative. This means that it's impossible to have a rectangle with such area and perimeter. Thus, the problem as stated has no valid solution.
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[tex]5\% \times 800 \\ = \frac{5}{100} \times 800 \\ \\ = \frac{4000}{100} = 40[/tex]