This video covers how to calculate percents of change by demonstrating how to calculate a price change. Just divide the price decrease by the original price, then convert the number to a percent by moving the decimal point.
|Ratios, Percentages, and Proportions||Percent Change|
Because Larry is a lobster. When the LBox was first introduced a few years
ago it was $249.
But by now the price has been slashed to $199.
What is the percent of the decrease? To find the formula we will use to solve the
problem, let’s ask ourselves what we’re looking for.
We know the reduced price, which we call the “price decrease…”
…and we want to know what percent of the original price that is, which we call the
To find the The Percent Decrease we will need to divide the Price Decrease by the Original
Price. First, let’s find the Price Decrease, which
is the Original Price minus the Discounted Price.
249 minus 199 equals 50. Now let’s plug in the numbers we know.
Price Decrease is 50, and Original Price is 249. So, this gives us our formula: Percent
decrease = 50 divided by 249.
That gives us point-201. But we are looking for a percent.
To convert it to a percent, just move the decimal point over two places to the right.
So the percent decrease equals 20.1 percent. Awesome! Despite Larry’s lack of opposable
thumbs, he can finally claw his way to beating The Legend of Zelda.
Larry’s math skills will be just fine, but we’re still concerned about how he makes