Question

The sale price S (in dollars) of an item is given by the formula S=L−rL, where L is the list price (in dollars) and r is the discount rate (in decimal form).

R=1- S/L

The list price of the shirt is $30. What is the discount rate?

Answer 1

Discount rate of the item will be
`r=1-(S)/(30)`.

Explanation:

The given formula is S = L - rL

Here S = sale price of an item

r = Discount rate

L = List price of the item

S - L = - rL

L - S = rL

`r=(1)/(L)(L-S)`

`r=1-(S)/(L)`

Now we have to calculate the discount price of the shirt when it's list price is $30.

By replacing L = 30 in the given formula

`r=1-(S)/(30)`

Discount rate of the item will be
`r=1-(S)/(30)`.

Answer 2

The sale price S (in dollars) of an item is given by the formula

S=L−rL , where L is the list price (in dollars) and r is the discount rate.

Since, S = L -rL

rL = L -S

r =
`(L-S)/(L)`

r =
`1-(S)/(L)`

Since, the listed price of the shirt is $30, we have to find the discount rate.

Therefore, r =
`1-(S)/(30)` is the discount rate.