Question

1. Explain how to calculate percent decreases or increases.  Many years ago comic books cost 10 cents a copy.  Visit a bookshop or newsstand.  Select a new comic book and explain the price increase in percent compared to the 10-cent comic. How important is the rounding process in your final answer?

2. How does the opposite process rule help solve for the variable in an equation?  If a Mercedes costs 3 times as much as a Saab, how could the opposite process rule be used?  The selling price of the Mercedes is $60,000.

Answer 1

1) Percent increase/decrease is calculated by first finding the change in the value of something and then comparing it with a base. This ratio is then multiplied by 100 to find the percentage increase/decrease

Currently price is $ 2.99 so that the percent increase is

Here, no rounding is performed as the numbers are comparable and the fraction is non-repeating

2) where m is cost of Merc, a is cost of Saab

Now we are told that is the cost of a Saab

In this way, the opposite process rule helps us solve for the variable 'a' which is the cost of Saab

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