78.31+78.24+78.17+22.72
= 78 .(31+24+17)+22.72
= 78 . 72 +22.72
= 72 .(78+22)
= 72 . 100
= 7200
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\(78.31+78.24+78.17+22.72\)
\(=78.\left(31+24+17\right)+22.72\)
\(=78.72+22.72\)
\(=72.\left(78+22\right)=72.100=7200\)
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