12.25.
Increment by 1.25 for the first time then increase the increment by 0.25 for each addition increment. 1+1.25+1.5+... would give the last increment as 2.5. Thus the answer is 9.75+2.5=12.25.
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12.25.
Increment by 1.25 for the first time then increase the increment by 0.25 for each addition increment. 1+1.25+1.5+... would give the last increment as 2.5. Thus the answer is 9.75+2.5=12.25.