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Question 981391: HHow can I work out the multiplier for decreasing by 30%
Answer by macston(5194)   (Show Source):
You can put this solution on YOUR website! .
Original number-((original number)(percent change/100%)}=decreased number
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Percent is per 100, so we divide the percent (30%) by 100% and multiply by the original amount to get the decrease (or increase). To get the decreased number, we subtract this from the original (for increase we add).
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Let x=original number:
x-((x)(30%/100%))=decreased number
x-(0.30x)=decreased number
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-OR-
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Since we decrease 100% by 30% (100%-30%) we are left with 70%. Again we divide by 100 (per cent=per 100) and get 0.70. So 0.70 x the original number=number decreased by 30%.
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Let x=original number:
Number decreased by 30%=((100%-30%))(x)/100%=(0.70)(x)
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