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HP 12c Platinum Financial Calculator - Cost, Price and Margin Calculations

Cost, price and margin concepts
Items that are bought and sold have a cost to the seller and a price to the buyer. The difference between the cost and the price is the gross amount the seller makes on the sale. There are two ways of computing the percentage this difference represents. The term markup uses the cost as the basis for the percentage calculation while margin looks at the price as the basis. The diagram in Figure 1 illustrates the relationship between cost and price.
Figure : Explaining the relationship between cost and price
The cost is the price minus a percent of the price called margin. The price can also be viewed as the cost plus a percentage of the cost called markup. The following expressions relate margin, price and cost with each other.
Figure : Expressions relating margin, price and cost with each other
How to calculate cost, price and margin on the HP 12c Platinum
The table below summarizes the keystroke sequence for each of the calculations above in RPN mode:
Figure : Summarizing the keystroke sequence (RPN mode)
The table below summarizes the keystroke sequence for each of the calculations above in algebraic mode:
Figure : Summarizing the keystroke sequence (algebraic mode)
Practice with solving interest rate conversion problems
Example 1
A television costs $195 and its price is $300. What is the margin obtained by the store that sells these TV sets?
Solution
The keystroke sequence to calculate the margin in this case is:
Figure : Calculating the margin
Answer
The margin is 35% for a $195 cost and a $300 price.
Example 2
The store manager wants to sell more TV sets and wants to reduce the price. If she cannot reduce the margin below 28%, what is the lowest price allowed for this TV set? Assume the same $195 cost.
Solution
The keystroke sequence to calculate the lower price in this case is:
In RPN mode:
In algebraic mode:
Figure : Calculating the price
Answer
The lowest price for this TV set is $270.83 given a 28% margin and a $195 cost.
Example 3
Based on these figures, the store manager decides to sell the TV set for $284.99. What is the margin achieved with this price?
Solution
The following keystroke sequence calculates the margin with the new price:
Figure : Calculating the margin with the new price
Answer
With the new price, the margin is now 31.58%.
Example 4
A new stereo system has a sales price of $150.75. Given a 35% margin, what is its cost?
Solution
The keystroke sequence to calculate the cost with these figures is:
In RPN mode:
In algebraic mode:
Figure : Calculating the cost
Answer
The cost is $97.99.
Example 5
When calculating the price of a toaster, a 45% markup was used. What is the margin obtained with the sale of a toaster with this markup?
Solution
The following keystroke sequence calculates the margin given a 45% markup:
In RPN mode:
In algebraic mode:
Figure : Calculating the margin given a 45% markup
Answer
A margin of 31.03% is equivalent to a 45% markup.

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