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chapter 4 percentages (use algebra (whole, old, cost, marked price),…
chapter 4 percentages
use algebra
whole
old
cost
marked price
percentage change
new-old / old x 100% = % change
decrease
old - new = decrease
decrease/old x 100% = %decrease
increase
new - old = increase
increase/old x 100% = %increase
profit
selling price - cost = profit
profit/cost x 100% = profit%
cost x profit% = profit
loss
cost - selling price = loss
loss/cos x 100% = loss%
cost x loss% = loss
discount
marked price - selling price
marked price x discout%
discount/marked price x 100%
whole and part
whole x % = part
part/whole x 100% = part%
selling price
cost x (1-profit%)
cost x (1-loss%)