设该文具的进价是x元,则售价是(x+2)元;按售价7折的卖价是0.7(x+2)元,根据:卖价—进价=盈利,可得方程:
0.7(x+2)-x=0.2
0.7x+1.4-x=0.2
1.4-0.3x=0.2
0.3x=1.4-0.2
0.3x=1.2
x=4
答:该文具的进价是4元.
设该文具的进价是x元,则售价是(x+2)元;按售价7折的卖价是0.7(x+2)元,根据:卖价—进价=盈利,可得方程:
0.7(x+2)-x=0.2
0.7x+1.4-x=0.2
1.4-0.3x=0.2
0.3x=1.4-0.2
0.3x=1.2
x=4
答:该文具的进价是4元.