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Who can do the last question on page 90 of the first volume of the sixth grade mathematics exercise book published by People's Education Press?
1, (80+120+90+10/00) x 0.1= 50 (yuan)
2, 50÷25%=200 (yuan)
3.50 yuan accounts for 25% of beverage bottles, 50% of old books are 100 yuan, and the remaining 25% are old newspapers.