1. 700+60+40=800
700+300-100=900
700+50+50=800
2. 500+60+40=600
500+300-100=700
500+50+50=600
3. 400+60+40=500
400+300-100=600
400+50+50=500
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500+300-100=700
400+50+50=500
1. 700+60+40=800
700+300-100=900
700+50+50=800
2. 500+60+40=600
500+300-100=700
500+50+50=600
3. 400+60+40=500
400+300-100=600
400+50+50=500