(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78×12)=?

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(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78×12)=?(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78

(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78×12)=?
(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78×12)=?

(1+19/78×1)+(1+19/78×2)+(1+19/78×3)+……+(1+19/78×12)=?
=12x1+19/78x(1+12)x12/2=12+19=31