售价是90+30=120.%D©0÷120=0.75.%D%A所以打7.5折.%D¡6÷[1-(3/5+30％)]%D%A=16÷[1-(6/10+3/10)]%D%A=16÷1/10%D%A=160%D%A满意请及时采纳,