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In percentages

the price of sugar increased by 20% .by what percent must the consumption be decreased so that the expenditure on sugar may remain the same?

explain properly with all steps. plz dont write only hte answer, i need the steps. urgent.
plz plz plz plz plz plz plz plz answer


Formula  %=  (R*100)/(R+100)%
where R=20%
%= 200/12
     = 16.66%
so by decrease the consumption to 16.66% the expenditure on sugar remain same
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