19941/2*79+6/25*790+31*7.9

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19941/2*79+6/25*790+31*7.9
19941/2*79+6/25*790+31*7.9

19941/2*79+6/25*790+31*7.9
19941/2*79+6/25*790+31*7.9
=1994.5*10x7.9+6/25*7.9x100+31*7.9
=(19945+24+31)x7.9
=20000x7.9
=158000