Fractions and decimals

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Ten companies sponsored a tournament and decided to give M rupees collectively.Two companies dropped and remaing agreed on paying their share equally.What was the increase in share of each company? The answer is M/40.How this answer comes.Any help would be appreciated.

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Before the two companies drop, assuming that the ten companies split M rupees equally, each company pays M/10. After two companies quit, the remaining eight companies would each pay M/8.