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Answers
125=1000/8なので
800(1+x/100)^2=1250
800(1+x/100)^2=10000/8
(1+x/100)^2=100/8^2
(1+x/100)^2-(10/8)^2=0
(x/100+1-10/8) (x/100+1+10/8)=0
(x/100-1/4) (x/100+9/4)=0
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