A map, where 2.5 centimeters represents the actual distance of 75 kilometers. The scale of this map is (1:3000000).

On the map with the scale of 1: 50000, the line segment of 8 cm represents the actual distance of (40000) meters.

A highway is 36 kilometers long, and when it is drawn on the map with the scale of 1: 600000, it should be drawn (6) cm.

1. Let the distance of this expressway on the map be xcm.

1:5000000=x:(5.5×2000000)

x=2.2

2. If the original price of A is 7x yuan, then B is 3x yuan.

(7x+70):(3x+70)=7:4

x=30

The original prices of these two commodities are respectively

7x=7×30=2 10

3x=3×30=90

3. (70+80) ×12 ÷ (1-20%) = 2250 (m)