A pair of jeans is on sale for 25% off the original price. Which expression represents the sale price? If the original price of the jeans is $40, evaluate the expression to find the sale price?

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Answer 1 · 2016-06-29T19:03:14

$x = $ 30$ $x = $30$

Remember that if there is a 25% discount, then the amount you are paying represents 75%. We know the original price (ie 100%)

There are several methods.
Simplest: Find 25% of the$40 and subtract to find the price to be paid.

$25 % o f 40 = \frac{25}{100} \times 40 = 10$ $25% of 40 = 25/100 xx 40=10$ discount

price = $40 - 10 = $ 30$ $40-10 =$30$

Second method. Find 75% immediately

$75 % o f 40 = \frac{75}{100} \times 40 = $ 30$ $75% of 40 = 75/100 xx 40 = $30$

You can do any percentage question using the concept of direct proportion.

$\frac{40}{100} = \frac{x}{75} if $40 is 100%, how much is 75%?$ $40/100 = x/75 " if $40 is 100%, how much is 75%?"$

$100 x = 75 \times 40 cross-multiply$ $100x = 75 xx40" cross-multiply"$

$x = \frac{75 \times 40}{100} this a possible expression for the sale price$ $x = (75xx40)/100 " this a possible expression for the sale price"$

$x = $ 30$ $x = $30$