Part A
2:7 x 10:x
7 x 10=70 and 2 x x= 2x.
70 divided by 2 is 35, So for 10 the actual is 35 ft.
2:7 x 20:x
7 x 20= 140 and 2 x x=2x.
140 divided by 2 is 70, So for 20 the actual is 70 ft.
Part B
35 x 0.30=10.5
70 x 0.30=21
10.5+21=31.5
$31.5
