19941/2*79+790*6/25

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19941/2*79+790*6/25

19941/2*79+790*6/25
19941/2*79+790*6/25

19941/2*79+790*6/25
19941/2*79+790*6/25
=79*(19941/2+10*6/25)
=79*(19941/2+12/5)
=79*(19941*5+24)/10
=(80-1)*99729/10
=8*99729-99729/10
=797832-99729.9
=787859.1