Question 553299
Here area= cost/rate
so,
.
{{{area= 12000/10 = 1200 yd^2 }}}
is the area.
perimeter is 140 yards.
so, 2(l+b) = 140
l+b=  70
b= 70- l ----(1)
.
area = l*b =l*(70-l)=1200
solve this, we will get l=40 yd or 30 yd.
when l= 40yd, b= 30yd
and when l=30yd , b= 40 yd.
.
so, dimensions are 40yd x 30 yd.