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chapter 9 Percentage, 9.4 Discount - Coggle Diagram
chapter 9 Percentage
9.1 Simple applications
of percentages
A. Finding the percentage
of a part
We use percentage a lot in our
daily life.
what percentage of the whole is a part?
percentage of a part(X%)=part(P)/whole(W)x100%
B. Finding a part from
a given percentage
P=W X(x%)
Sometimes, the quiz will not
giving you a direct percentage,
how can we do next?
we can let 100% subtract the
percentage that we given
C. finding the whole from a given
percentage
we can solve those problem
by
equations
P=W X(x%)
we can use this formula
to solve those problem
9.3 Profit and loss
we will learn
profit(盈利)
and
loss(亏本)
in this section
profit
profit=selling price-cost
percentage profit =profit/cost x 100%
selling price=cost x (1+percentage profit)
loss
percentage loss=loss/cost x 100%
selling price=cost x (1-percentage loss)
loss= cost-selling price
9.2 Percentage change
we will learn about the
change
of
percentages
increase
increase=new value-original value
percentage increase=increase/original x100%
we can use these formula
to calculate the increase
new=original x (1+percentage
increase)
decrease
new =original x (1-percentage decrease)
we can use these formula
to calculate the decrease
decrease=original-new
percentage decrease=decrease/original x 100%
change
change=new - original
new=original x (1+percentage
increase)
percentage
change=change/original x 100%
9.4 Discount
we will learn discount in this section
discount=marked price-selling price
selling price=market price x (1- percentage discount)
percentage
discount=discount/market price x 100%
