Equation: 875 (1-x) (1-x) = 560.

The solution is x=20%

2 let the monthly growth rate be x.

Equation: 250+250 * (1+x)+250 (1+x) (1+x) = 843.6.

250*(3+3x+x*x)=843.6

250*[(x+3/2)(x+3/2)+3/4]=843.6

X= (approximately equal to) 12%

Let the width from small rectangle to large rectangle be x.

(24-2x)*( 12-2x)= 24 * 12 * 5/9

288-72x+4x*x= 160

There are two solutions x 1=2 x2= 16.

X2 (total width 12m)

Positive solution x=2

The length of the small rectangle is 24-4=20.

The width is 12-4=8.