So x =1530 *1.15/0.9 =1955 yuan.

So the commodity price is 1955 yuan.

Solution: Let the cost of each piece of this garment be X yuan.

According to the meaning: (1+40%)? 80%x-x= 15

Solution: x= 125

Solution: Suppose Xiaoming takes x minutes by car, then he walks 14-x minutes.

(2800/7)x+(2800/56)( 14-x)= 2800

x=6

Solution: Suppose A's sales last year were 10000 yuan.

( 1+ 15%)x+( 1+ 10%)( 150-x)= 170

The solution is x= 100.

∴A This year's sales volume is100 (1+15%) =115 (ten thousand yuan).

B The annual sales (1+10%) (150-100) = 550 (ten thousand yuan).

Solution: Let the speed be x m/s and the vehicle length be y m..

30X-Y=500

20X+Y=500

X=20，Y= 100。