某国生产棉布需进口棉纱,棉布和棉纱的国际市场售价分别为每单位100美元和60美元。若该国对进口棉布和进口棉纱分别征收10%和20%的关税,则该国对棉布的有效保护率为()
A.-5%
B.-10%
C.10%
D.20%
正确答案是A
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