Mathematics
Junior High

6の(3)も教えてください🙏
解説 はじめの150個の利益は
0.3a×150=45a円 残り100個の利益は
( 1.3a×0.8-a )×100=0.04a×100=4a円
よって10000b=49a

なぜ上の式の1.3がよくわかりません..

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