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1. $25
2. $25+$50=$75
3. $25+$50+$75=$150
4. $25+$50+$75+100=$250
5. $25+$50+$75+100+$250=$500
6. $25+$50+$75+100+$250+$500=$1000
7. $25+$50+$75+100+$250+$500+$1000=$2000
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